bluuebunny/crossref_metadata_2025 huggingface dataset:
High Strain Rate Deformation Behavior and Recrystallization of Alloy 718
Authors: Moretti Marie Anna , Dalai Biswajit , Åkerström Paul , Arvieu Corinne , Jacquin Dimitri , Lacoste Eric , Lindgren Lars-Erik
Published: October 2021

To study the deformation behavior and recrystallization of alloy 718 in annealed and aged state, compression tests were performed using Split-Hopkinson pressure bar (SHPB) at high strain rates (1000 to 4000 s−1), for temperatures between 20$$^\circ $$∘C and 1100$$^\circ $$∘C (293 K to 1373 K). Optical microscope (OM) and electron back-scatter diffraction (EBSD) technique were employed to characterize the microstructural evolution of the alloy. The stress–strain curves show that the flow stress level decreases with increasing temperature and decreasing strain rate. In addition, up to 1000$$^\circ $$∘C, the aged material presents higher strength and is more resistant to deformation than the annealed one, with a yield strength around 400 MPa higher. For both states, dynamic and meta-dynamic recrystallization occurred when the material is deformed at 1000$$^\circ $$∘C and 1100$$^\circ $$∘C, leading to a refinement of the microstructure. As necklace structures were identified, discontinuous recrystallization is considered to be the main recrystallization mechanism. The recrystallization kinetics is faster for higher temperatures, as the fraction of recrystallized grains is higher and the average recrystallized grain size is larger after deformation at 1100$$^\circ $$∘C than after deformation at 1000$$^\circ $$∘C.
Role of Ureteroscopy in Treatment of Upper Tract Urothelial Carcinoma
Authors: Ng Chieng Hin Jeremy , Hettiarachchilage Dinul , Gravestock Paul , Rai Bhavan , Somani Bhaskar K. , Veeratterapillay Rajan
Published: October 2021

Purpose of Review

Upper tract urothelial carcinoma (UTUC) is uncommon accounting for less than 10% of all urothelial tumours. Ureteroscopic management (URS) is the first line treatment for low-risk disease and has been increasingly utilised due to technological advances and increasing surgical experience. This review looks at patient outcomes relating to URS, emerging technologies and the role of adjuvant intracavitary therapy in the management of UTUC.

Recent Findings

URS has firmly established itself in the management algorithm for UTUC, and a good body of evidence supports its use for low-risk disease, wherein oncological outcomes are comparable to traditional nephroureterectomy (RNU). Larger tumours can now be managed using URS with a lower morbidity than radical surgery, though with higher associated local recurrence rate and risk of progression to RNU, and as a result, patient selection and close surveillance remains key. There is limited evidence for adjuvant intracavitary therapy (Mitomycin C or BCG) in UTUC although the development of novel polymers and biodegradable stents may improve drug delivery to the upper urinary tract.

URS has a clearly defined role in low-risk UTUC, and its use in larger tumours appears to be appropriate in a selected cohort of patients. The efficacy of adjuvant intracavitary therapy is as of yet undetermined, though developments in delivery techniques are promising. Likewise further developments of laser technology are anticipated to further expand the role of URS.
Oxygen-Induced and pH-Induced Direct Current Artifacts on Invasive Platinum/Iridium Electrodes for Electrocorticography
Authors: Major Sebastian , Gajovic-Eichelmann Nenad , Woitzik Johannes , Dreier Jens P.
Published: October 2021

Background

Spreading depolarization (SD) and the initial, still reversible phase of neuronal cytotoxic edema in the cerebral gray matter are two modalities of the same process. SD may thus serve as a real-time mechanistic biomarker for impending parenchyma damage in patients during neurocritical care. Using subdural platinum/iridium (Pt/Ir) electrodes, SD is observed as a large negative direct current (DC) shift. Besides SD, there are other causes of DC shifts that are not to be confused with SD. Here, we systematically analyzed DC artifacts in ventilated patients by observing changes in the fraction of inspired oxygen. For the same change in blood oxygenation, we found that negative and positive DC shifts can simultaneously occur at adjacent Pt/Ir electrodes.

Methods

Nurses and intensivists typically increase blood oxygenation by increasing the fraction of inspired oxygen at the ventilator before performing manipulations on the patient. We retrospectively identified 20 such episodes in six patients via tissue partial pressure of oxygen (ptiO2) measurements with an intracortical O2 sensor and analyzed the associated DC shifts. In vitro, we compared Pt/Ir with silver/silver chloride (Ag/AgCl) to assess DC responses to changes in pO2, pH, or 5-min square voltage pulses and investigated the effect of electrode polarization on pO2-induced DC artifacts.

Results

Hyperoxygenation episodes started from a ptiO2 of 37 (30–40) mmHg (median and interquartile range) reaching 71 (50–97) mmHg. During a total of 20 episodes on each of six subdural Pt/Ir electrodes in six patients, we observed 95 predominantly negative responses in six patients, 25 predominantly positive responses in four patients, and no brain activity changes. Adjacent electrodes could show positive and negative responses simultaneously. In vitro, Pt/Ir in contrast with Ag/AgCl responded to changes in either pO2 or pH with large DC shifts. In response to square voltage pulses, Pt/Ir falsely showed smaller DC shifts than Ag/AgCl, with the worst performance under anoxia. In response to pO2 increase, Pt/Ir showed DC positivity when positively polarized and DC negativity when negatively polarized.

Conclusions

The magnitude of pO2-induced subdural DC shifts by approximately 6 mV was similar to that of SDs, but they did not show a sequential onset at adjacent recording sites, could be either predominantly negative or positive in contrast with the always negative DC shifts of SD, and were not accompanied by brain activity depression. Opposing polarities of pO2-induced DC artifacts may result from differences in baseline electrode polarization or subdural ptiO2 inhomogeneities relative to subdermal ptiO2 at the quasi-reference.
Context-Based Resilience in Cyber-Physical Production System
Authors: Bagozi Ada , Bianchini Devis , Antonellis Valeria De
Published: October 2021

Cyber-physical systems are hybrid networked cyber and engineered physical elements that record data (e.g. using sensors), analyse them using connected services, influence physical processes and interact with human actors using multi-channel interfaces. Examples of CPS interacting with humans in industrial production environments are the so-called cyber-physical production systems (CPPS), where operators supervise the industrial machines, according to the human-in-the-loop paradigm. In this scenario, research challenges for implementing CPPS resilience, promptly reacting to faults, concern: (i) the complex structure of CPPS, which cannot be addressed as a monolithic system, but as a dynamic ecosystem of single CPS interacting and influencing each other; (ii) the volume, velocity and variety of data (Big Data) on which resilience is based, which call for novel methods and techniques to ensure recovery procedures; (iii) the involvement of human factors in these systems. In this paper, we address the design of resilient cyber-physical production systems (R-CPPS) in digital factories by facing these challenges. Specifically, each component of the R-CPPS is modelled as a smart machine, that is, a cyber-physical system equipped with a set of recovery services, a Sensor Data API used to collect sensor data acquired from the physical side for monitoring the component behaviour, and an operator interface for displaying detected anomalous conditions and notifying necessary recovery actions to on-field operators. A context-based mediator, at shop floor level, is in charge of ensuring resilience by gathering data from the CPPS, selecting the proper recovery actions and invoking corresponding recovery services on the target CPS. Finally, data summarisation and relevance evaluation techniques are used for supporting the identification of anomalous conditions in the presence of high volume and velocity of data collected through the Sensor Data API. The approach is validated in a food industry real case study.
This Sacred Life
Authors: Wirzba Norman
Published: October 2021

In a time of climate change, environmental degradation, and social injustice, the question of the value and purpose of human life has become urgent. What are the grounds for hope in a wounded world? This Sacred Life gives a deep philosophical and religious articulation of humanity's identity and vocation by rooting people in a symbiotic, meshwork world that is saturated with sacred gifts. The benefits of artificial intelligence and genetic enhancement notwithstanding, Norman Wirzba shows how an account of humans as interdependent and vulnerable creatures orients people to be a creative, healing presence in a world punctuated by wounds. He argues that the commodification of places and creatures needs to be resisted so that all life can be cherished and celebrated. Humanity's fundamental vocation is to bear witness to God's love for creaturely life, and to commit to the construction of a hospitable and beautiful world.
Poetry and Bondage
Authors: Brady Andrea
Published: October 2021

Poetry and Bondage is a groundbreaking and comprehensive study of the history of poetic constraint. For millennia, poets have compared verse to bondage – chains, fetters, cells, or slavery. Tracing this metaphor from Ovid through the present, Andrea Brady reveals the contributions to poetics of people who are actually in bondage. How, the book asks, does our understanding of the lyric – and the political freedoms and forms of human being it is supposed to epitomise – change, if we listen to the voices of enslaved and imprisoned poets? Bringing canonical and contemporary poets into dialogue, from Thomas Wyatt to Rob Halpern, Emily Dickinson to M. NourbeSe Philip, and Phillis Wheatley to Lisa Robertson, the book also examines poetry that emerged from the plantation and the prison. This book is a major intervention in lyric studies and literary criticism, interrogating the whiteness of those disciplines and exploring the possibilities for committed poetry today.
Pandemics at Work: Convergence of Epidemiology and Ethics
Authors: Thornton Michele , Martin William “Marty”
Published: October 2021

Like COVID-19, new infectious disease outbreaks emerge almost annually, and studies predict that this trend will continue due to a variety of factors, including an aging population, ease of travel, and globalization of the economy. In response to episodic public health crises, governments and organizations develop, implement, and enforce policies, procedures, protocols, and programs. The epidemiological triad is both a model of disease causation and fundamentally used to design and deploy such control measures. Here we adapt this model to the workplace setting and use the epidemiological triad to characterize the related ethical challenges in implementing the control measures employers face as a guide for a workplace intervention framework. Through this approach, our aim is to show how an integrated ethical framework, grounded in epidemiological principles, has important implications for how we categorize, understand, and resolve the difficult decisions that emerge in the workplace under pandemic conditions.
Humanising brain injury rehabilitation: a qualitative study examining humanising approaches to engagement in the context of a storytelling advocacy programme
Authors: D’Cruz Kate , Douglas Jacinta , Serry Tanya
Published: October 2021

Objectives:

Building upon the findings of an earlier study that explored the experience and impact of narrative storytelling following acquired brain injury (ABI), this study sought to examine the engagement of storytelling facilitators with storytellers.

Methods:

Transcripts of in-depth interviews conducted with six storytelling facilitators were analysed drawing upon content analysis. The analysis included a process of mapping previously analysed data (D’Cruz et al., 2020b) to a humanising values framework (Galvin & Todres, 2013; Todres et al., 2009).

Results:

The findings of this study provide insights into how facilitators engaged in humanising practice within the context of a storytelling advocacy programme. The facilitator participants ranged in years of facilitation experience from 1 to 11 years, with a mix of professional backgrounds, including health care (3), journalism (1) and community development (2). Analysed facilitator data mapped to each of the eight dimensions of the framework (insiderness, agency, uniqueness, togetherness, sense-making, personal journey, sense of place and embodiment), with a breadth of codes represented in each dimension, revealing the depth of humanisation.

Conclusions:

This study extends our understanding of approaches to engagement with adults living with ABI, demonstrating the humanising potential of storytelling. Furthermore, the findings help us to think about what it means to be human, guiding us to find ways to better partner with and support adults living with brain injury.
Essential Professional Competencies for Basic Midwifery Practice in Disasters: A Qualitative Study
Authors: Mirmohammad Ali Ie Mandana , Nikbakht Nasrabadi Alireza , Sohrabizadeh Sanaz , Khani Jazani Reaza
Published: October 2021

Objective:

Educated midwives have a range of abilities to use their skills in normal situations. Given that working under normal situations is different from critical conditions, the recognition of skills and competencies required for midwifery practice is important. The purpose of this study was to explore specific professional competencies that midwives need to have for the provision of reproductive health services during disasters.

Methods:

This was a qualitative study using a content analysis method. Subjects were 19 midwives with the work experience of practice in disaster situations. Data were collected using semi-structured interviews and analysis was based on the approach suggested by Graneheim and Lundman.

Results:

Six major categories developed in this study were “safe pregnancy,” “safe childbirth,” “women’s health care,” “contraception,” “violence and sexually transmitted infections,” and “infant care.”

Conclusions:

Midwives can play a very important role in the provision of reproductive health services. Therefore, they must have special capabilities and capacities. Policies and curriculum development are recommended in accordance with the needs of reproductive health in disaster-affected communities.
On the stability of the boundary layer at the bottom of propagating surface waves
Authors: Blondeaux Paolo , Pralits Jan Oscar , Vittori Giovanna
Published: October 2021

This study contributes to an improved understanding of the stability of the boundary layer generated at the bottom of a propagating surface wave of small but finite amplitude such that both a second harmonic component and a steady streaming component, which are superimposed on the main oscillatory flow, assume significant values. A linear stability analysis of the laminar flow is made to determine the conditions leading to transition and turbulence appearance. The Reynolds number of the phenomenon is assumed to be large and a ‘momentary’ criterion of stability is used. The results show that, at a given location, the laminar regime becomes unstable when the flow close to the bottom reverses its direction from the onshore to the offshore direction and the Reynolds number exceeds a first critical value

$R_{\delta ,c1}$

. However, close to the critical condition, the flow is expected to relaminarize during the other phases of the cycle. Only when the Reynolds number is increased does turbulence tend to appear also after the passage of the wave trough when the flow close to the bottom reverses from the offshore to the onshore direction. When the Reynolds number is further increased and becomes larger than a second ‘threshold’ value, the growth rate of the perturbations becomes positive over the entire wave period. The obtained results suggest the existence of four different flow regimes: the laminar regime, the disturbed laminar regime, the intermittently turbulent regime and the fully developed turbulent regime.
The dietary arachidonic acid improved growth and immunity of honey bee (Apis mellifera ligustica)
Authors: Yu Jing , Zhang Weixing , Chi Xuepeng , Chen Wenfeng , Li Zhenfang , Wang Ying , Liu Zhenguo , Wang Hongfang , Xu Baohua
Published: October 2021

Honeybees cannot synthesize arachidonic acid (ARA) themselves, only obtain it from food. Most pollen is deficient or contains a small amount of ARA. The necessity of supplementary ARA in bees’ diet has not been studied. The objective of this study was to investigate the effects of dietary ARA levels on the growth and immunity ofApis mellifera ligustica. A total of 25 honeybee colonies were randomly assigned to five dietary groups which were fed basic diets supplemented with 0, 2, 4, 6, and 8% of ARA. The diet with 4% ARA improved the body weight of newly emerged worker bees compared with the control group. Supplement of ARA in honeybee diets changed the fatty acid composition of honeybee body. SFA and MUFA contents of bees’ body declined, and PUFA content rised in the ARA group. Compared with the control group, the supplement of ARA in honeybee diets increased the contents of ARA, C22:6n-3 (DHA) and C18:3n-6 in bees’ body significantly, but decreased the contents of C16:1 and C18:3n-3. The diet supplied with 4% ARA reduced the mortality rate of honeybee infected withEscherichia coli. The activity of immune enzymes (phenoloxidase, antitrypsin, and lysozyme) and the mRNA expression levels of immune genes (defensin-2,toll,myd88, anddorsal) were improved by ARA diets to varying degrees depending on the ARA levels, especially 4% ARA. These results suggested that dietary ARA could improve the growth, survival, and immune functions of honeybees. Supplement of ARA in bees’ diet would be valuable for the fitness of honeybees.
CONSTITUTIONAL AND LEGAL CHALLENGES IN THE ADMINISTRATIVE STATE
Authors: Pestritto Ronald J.
Published: October 2021

Following the Roosevelt administration’s implementation of New Deal programs in the 1930s, the federal courts began to interpret the Constitution in a way that accommodated the rise of the “administrative state,” and bureaucratic policymaking continues to persist as a central feature of American government today. This essay submits, however, that the three pillars supporting the administrative state—the congressional delegation of Article I powers to the executive branch, the combination of powers within individual administrative entities, and the insulation of administrators from political control—might be reconsidered by the courts in the near future. After showing that the constitutionality of the administrative state has come under recent judicial scrutiny, the essay turns to the administrative law principle of deference, and argues that a reassessment of the Chevron doctrine seems imminent. Finally, the essay examines federal courts’ heavy use of “hard look” review as a means of curtailing agency discretion during recent administrations, and concludes that this judicial practice stands in uneasy tension with republican principles.
Machine learning algorithms for predicting undernutrition among under-five children in Ethiopia
Authors: Bitew Fikrewold H , Sparks Corey S , Nyarko Samuel H
Published: October 2021

Objective:

Child undernutrition is a global public health problem with serious implications. In this study, we estimate predictive algorithms for the determinants of childhood stunting by using various machine learning (ML) algorithms.

Design:

This study draws on data from the Ethiopian Demographic and Health Survey of 2016. Five ML algorithms including eXtreme gradient boosting, k-nearest neighbours (k-NN), random forest, neural network and the generalised linear models were considered to predict the socio-demographic risk factors for undernutrition in Ethiopia.

Setting:

Households in Ethiopia.

Participants:

A total of 9471 children below 5 years of age participated in this study.

Results:

The descriptive results show substantial regional variations in child stunting, wasting and underweight in Ethiopia. Also, among the five ML algorithms, xgbTree algorithm shows a better prediction ability than the generalised linear mixed algorithm. The best predicting algorithm (xgbTree) shows diverse important predictors of undernutrition across the three outcomes which include time to water source, anaemia history, child age greater than 30 months, small birth size and maternal underweight, among others.

Conclusions:

The xgbTree algorithm was a reasonably superior ML algorithm for predicting childhood undernutrition in Ethiopia compared to other ML algorithms considered in this study. The findings support improvement in access to water supply, food security and fertility regulation, among others, in the quest to considerably improve childhood nutrition in Ethiopia.
Home-delivered meal programme participants may be at greater risk of malnutrition without the meal programme
Authors: Sakr-Ashour Fayrouz A , Wambogo Edwina , Song Hee-Jung , Sahyoun Nadine R
Published: October 2021

Objectives:

(1) To examine total quality of foods consumed on the day a home-delivered meal (HDM) of the Older Americans Act Nutrition Program (OAANSP) was served, and when a HDM was not served; and (2) to estimate proportion of HDM participants and non-participants meeting the daily average recommendations for guidance-based foods and nutrients.

Design:

Cross-sectional study.

Setting:

Data were obtained from the national 2015–2017 Outcomes Evaluation Study of HDM participants in the USA.

Participants:

Adults aged 67 years and older (n 1227), 620 HDM recipients and 607 matching non-participants examined in three groups: (1) meal recipients who received a HDM on the day of the 24-h dietary recall; (2) no-meal recipients who did not receive a HDM on the day of the recall and (3) matching HDM non-participants.

Results:

Healthy Eating Index (HEI)-2010 scores of HDM participants were significantly lower on the day the meal was not received compared with when a meal was received (52·5 v. 63·4, P < 0·0001). There was no significant difference in the total HEI-2010 scores of HDM meal recipients and HDM non-participants. Despite the meal, less than 20 % of HDM participants and non-participants met the 2010-Diet Guidelines for Americans recommended average daily intake for fruit, vegetables, dairy, protein foods and solid fats.

Conclusion:

HDM participants’ diet quality is poorer when they do not receive a meal putting them at increased risk of malnutrition. Expanding the OAANSP to offer meals on weekends and/or to include more than one meal/d is recommended to improve the diet of this vulnerable population.
Conceptualising factors impacting nutrition services coverage of treatment for acute malnutrition in children: an application of the Three Delays Model in Niger
Authors: Kodish Stephen R , Allen Ben GS , Salou Halidou , Schwendler Teresa R , Isanaka Sheila
Published: October 2021

Objective:

The Three Delays Model is a conceptual model traditionally used to understand contributing factors of maternal mortality. It posits that most barriers to health services utilisation occur in relation to one of three delays: (1) Delay 1: delayed decision to seek care; (2) Delay 2: delayed arrival at health facility and (3) Delay 3: delayed provision of adequate care. We applied this model to understand why a community-based management of acute malnutrition (CMAM) services may have low coverage.

Design:

We conducted a Semi-Quantitative Evaluation of Access and Coverage (SQUEAC) over three phases using mixed methods to estimate programme coverage and barriers to care. In this manuscript, we present findings from fifty-one semi-structured interviews with caregivers and programme staff, as well as seventy-two structured interviews among caregivers only. Recurring themes were organised and interpreted using the Three Delays Model.

Setting:

Madaoua, Niger.

Participants:

Totally, 123 caregivers and CMAM program staff.

Results:

Overall, eleven barriers to CMAM services were identified in this setting. Five barriers contribute to Delay 1, including lack of knowledge around malnutrition and CMAM services, as well as limited family support, variable screening services and alternative treatment options. High travel costs, far distances, poor roads and competing demands were challenges associated with accessing care (Delay 2). Finally, upon arrival to health facilities, differential caregiver experiences around quality of care contributed to Delay 3.

Conclusions:

The Three Delays Model was a useful model to conceptualise the factors associated with CMAM uptake in this context, enabling implementing agencies to address specific barriers through targeted activities.
Assessing the Church of England’s Leadership Response to the Covid-19 Pandemic: Listening to the Voice of Rural Lay People
Authors: McKenna Ursula
Published: October 2021

The aim of the present study is to analyse the qualitative text written on the back page of a quantitative survey concerned with the Church of England’s response to the Covid-19 pandemic. Of the 1460 rural lay people in England who took part in the Coronavirus, Church & You survey, 501 wrote further (sometimes detailed) comments on the back page (34 per cent participation rate). This study analyses the comments made by a subsection of these 501 rural lay people, specifically the 52 participants who voiced their views on how the Church of England’s leadership responded during the first four months of the Covid-19 pandemic. Analysis identified a number of issues and concerns, including: a lack of quality leadership, comparing with other Churches, becoming irrelevant, centralizing action, closing rural churches, neglecting rural people, neglecting rural clergy, marginalizing rural communities, using the kitchen table, and looking to the future. Overall, rural lay people were disappointed with the response of church leadership to the first national lockdown. If these churchgoers are to be fruitfully reconnected with their churches after the pandemic, then leadership of the Church of England may need to hear and to take seriously their concerns.
Brief psychological interventions for anxiety and depression in a secondary care adult mental health service: an evaluation
Authors: Roberts Kate , Travers-Hill Emma , Coker Siân , Troup Jordan , Casey Stephanie , Parkin Katherine , Kim Youngsuk
Published: October 2021

Due to continuing pressures on the UK National Health Service’s mental health services, there has been increased interest in the development of brief psychological interventions (BPIs). These interventions are usually defined as including selected components of established psychological interventions, delivered over fewer sessions, and by staff with less specialised training (paraprofessionals). Cognitive behavioural therapy (CBT)-based BPIs for anxiety and depression have been found to be helpful for clients with mild to moderate mental health problems. This project evaluates the introduction of BPIs for anxiety and depression in a secondary care adult mental health service, with clients experiencing moderate to severe mental health difficulties. The service developed CBT-based manuals for anxiety (anxiety management) and depression (behavioural activation) BPIs. The BPIs were delivered by mental health workers without core therapeutic training, who were offered training and group supervision by psychologists in the team. Measures of anxiety (GAD-7), depression (PHQ-9), wellbeing (SWEMWBS) and functioning (WSAS) were completed at the start and end of treatment. The data reported from a 2-year period suggest that BPIs are associated with reductions in symptoms of anxiety and low mood, and improvements in wellbeing and functioning. Whilst this is a small-scale initial evaluation, the results are promising for the potential benefit of BPIs for clients in secondary care settings. Given that this new way of working has possible additional benefits such as improving access to psychological treatment and cost-effectiveness, further research in the area is warranted and encouraged.

Key learning aims

(1)

To overview the current evidence for BPIs.

(2)

To outline a possible model for offering BPIs in secondary care.

(3)

To illustrate the potential positive effects of BPIs within a secondary care population.

(4)

To consider the need for future research and development of BPIs.
Moving beyond a ‘one-size-fits-all’ rationale in global mental health: prospects of a precision psychology paradigm
Authors: Purgato Marianna , Singh Rakesh , Acarturk Ceren , Cuijpers Pim
Published: October 2021

Research on the effectiveness of mental health and psychosocial support interventions for common mental disorders in global mental health provides controversial results. These results are based on mean values for different groups, often without due consideration of individual-level characteristics and contextual factors. Against this background, and based on the recent development of a precision theoretical framework in clinical psychology, which is calling for a renewed perspective on the development and implementation of trial designs, we propose to develop a precision psychology paradigm in global mental health, with emphasis not only on individual clinical and socio-demographic data, but also on the social determinants of mental health. A precision psychology paradigm would require a coordinated action of academics, stakeholders and humanitarian workers in planning a global mental health research agenda, including the design of trials aimed at reliably approximate prediction of intervention response at individual level.
From Machiavellianism to Unethical Behavior: A Cross-Level Examination of Cultural Factors
Authors: Hussain Ghulam , Samreen Farah , Ismail Wan Khairuzzaman Wan , Riaz Amir , Azhar Johaver
Published: October 2021

This study establishes the relationship between a manager’s Machiavellian personality and unethical behavior. It also tests the cross-level interaction effects of collectivism and power distance on the relationship between a Machiavellian personality and unethical behavior. The multi-level and multi-source data are collected from 22 public sector organizations from which 202 responses from managers about their personalities, power distance, and collectivism, and 626 subordinates’ ratings of the managers’ unethical behavior were received and used. The results show that Machiavellian personality has a positive relationship with unethical behavior. The cross-level interaction effects also show that cultural dimensions such as power distance, and collectivism—significantly and positively moderate the relationship between Machiavellian personality and unethical behavior. Based on the study’s findings, implications for theory and practice are offered.
Earthcasting: Geomorphic Forecasts for Society
Authors: Ferdowsi Behrooz , Gartner John D. , Johnson Kerri N. , Kasprak Alan , Miller Kimberly L. , Nardin William , Ortiz Alejandra C. , Tejedor Alejandro
Published: October 2021

Over the last several decades, the study of Earth surface processes has progressed from a descriptive science to an increasingly quantitative one due to advances in theoretical, experimental, and computational geosciences. The importance of geomorphic forecasts has never been greater, as technological development and global climate change threaten to reshape the landscapes that support human societies and natural ecosystems. Here we explore best practices for developing socially relevant forecasts of Earth surface change, a goal we are calling “earthcasting”. We suggest that earthcasts have the following features: they focus on temporal (∼1–∼100 years) and spatial (∼1 m–∼10 km) scales relevant to planning; they are designed with direct involvement of stakeholders and public beneficiaries through the evaluation of the socioeconomic impacts of geomorphic processes; and they generate forecasts that are clearly stated, testable, and include quantitative uncertainties. Earthcasts bridge the gap between Earth surface researchers and decision‐makers, stakeholders, researchers from other disciplines, and the general public. We investigate the defining features of earthcasts and evaluate some specific examples. This paper builds on previous studies of prediction in geomorphology by recommending a roadmap for (a) generating earthcasts, especially those based on modeling; (b) transforming a subset of geomorphic research into earthcasts; and (c) communicating earthcasts beyond the geomorphology research community. Earthcasting exemplifies the social benefit of geomorphology research, and it calls for renewed research efforts toward further understanding the limits of predictability of Earth surface systems and processes, and the uncertainties associated with modeling geomorphic processes and their impacts.
A Visual Tour of Carbon Export by Sinking Particles
Authors: Durkin Colleen A. , Buesseler Ken O. , Cetinić Ivona , Estapa Margaret L. , Kelly Roger P. , Omand Melissa
Published: October 2021

To better quantify the ocean's biological carbon pump, we resolved the diversity of sinking particles that transport carbon into the ocean's interior, their contribution to carbon export, and their attenuation with depth. Sinking particles collected in sediment trap gel layers from four distinct ocean ecosystems were imaged, measured, and classified. The size and identity of particles was used to model their contribution to particulate organic carbon (POC) flux. Measured POC fluxes were reasonably predicted by particle images. Nine particle types were identified, and most of the compositional variability was driven by the relative contribution of aggregates, long cylindrical fecal pellets, and salp fecal pellets. While particle composition varied across locations and seasons, the entire range of compositions was measured at a single well‐observed location in the subarctic North Pacific over one month, across 500 m of depth. The magnitude of POC flux was not consistently associated with a dominant particle class, but particle classes did influence flux attenuation. Long fecal pellets attenuated most rapidly with depth whereas certain other classes attenuated little or not at all with depth. Small particles (<100 μm) consistently contributed ∼5% to total POC flux in samples with higher magnitude fluxes. The relative importance of these small particle classes (spherical mini pellets, short oval fecal pellets, and dense detritus) increased in low flux environments (up to 46% of total POC flux). Imaging approaches that resolve large variations in particle composition across ocean basins, depth, and time will help to better parameterize biological carbon pump models.
Air‐Sea Turbulent Heat Flux Feedback Over Mesoscale Eddies
Authors: Moreton Sophia , Ferreira David , Roberts Malcolm , Hewitt Helene
Published: October 2021

Air‐sea turbulent heat fluxes play a fundamental role in generating and dampening sea surface temperature (SST) anomalies. To date, the turbulent heat flux feedback (THFF) is well quantified at basin‐wide scales (20 ) but remains unknown at the oceanic mesoscale (10–100 km). Here, using an eddy‐tracking algorithm in three configurations of the coupled climate model HadGEM3‐GC3.1, the THFF over mesoscale eddies is estimated. The THFF magnitude is strongly dependent on the ocean‐to‐atmosphere regridding of SST, a common practice in coupled models for calculating air‐sea heat flux. Our best estimate shows that the mesoscale THFF ranges between 35 and 45 globally, across different eddy amplitudes. Increasing the ratio of atmosphere‐to‐ocean grid resolution can lead to an underestimation of the THFF, by as much as 80% for a 6:1 resolution ratio. Our results suggest that a large atmosphere‐to‐ocean grid ratio can result in an artificially weak dampening of mesoscale SST anomalies.
Ion Outflow and Escape in the Terrestrial Magnetosphere: Cluster Advances
Authors: Dandouras Iannis
Published: October 2021

Cluster was the first mission in the terrestrial magnetosphere to involve four spacecraft in a tetrahedral configuration, providing three‐dimensional measurements of the space plasma parameters. Cluster was also equipped with a very comprehensive instrumentation, allowing the measurement of the ion populations outflowing from the ionosphere, their circulation in the magnetosphere, and their eventual escape to outer space. The observations of the outflowing and escaping ion populations performed by Cluster are reviewed and the most prominent results highlighted. These show the dominance in the magnetotail lobes of cold plasma outflows originating from the polar caps. For the energetic heavy ion outflow, the cusps constitute the main source. Their transport and acceleration through the polar cap into the lobes and then into the plasma sheet has been characterized. The dependence of the polar outflow on the solar wind parameters and on the geomagnetic activity has been evaluated for both cold ion populations and heavy energetic ions. For the latter, outflow has been observed during all periods but an increase by two orders of magnitude has been shown during extreme space weather conditions. This outflow is adequate to change the composition of the atmosphere over geological timescales. At lower latitudes, the existence of a plasmaspheric wind, providing a continuous leak from the plasmasphere, has been demonstrated. The general scheme of the outflowing ion circulation in the magnetosphere or escape, and its dependence on the IMF conditions, has been outlined. However, several questions remain open, waiting for a future space mission to address them.
Electromagnetic Field Generated by an Earthquake Source Due to Motional Induction in 3D Stratified Media, and Application to 2008 Mw 6.1 Qingchuan Earthquake
Authors: Zhao Jie , Gao Yongxin , Tang Ji , Klemperer Simon L. , Wen Jian , Chen Chieh‐Hung , Chong Jiajun
Published: October 2021

Movement of the conductive subsurface medium in the Earth's magnetic field can generate electromagnetic (EM) disturbances. This phenomenon is referred to as the motional induction (MI) effect and, though previously proposed as a possible mechanism for the generation of earthquake‐associated EM signals, has not yet been well understood. In this study, we present a semianalytical method to derive the EM response to an earthquake due to the MI effect in a 3D horizontally layered model. We solve the coupled elastodynamic and Maxwell's equations in the frequency–wavenumber domain through the global matrix method and then compute the seismic and EM responses in the time domain. We first verify the proposed method by comparing results to the analytical solution in a full‐space model and then conduct numerical simulations to investigate the properties of the EM fields and their sensitivities to the rock conductivity. Finally, we use the proposed method to model coseismic EM data observed during the 2008 Mw 6.1 Qingchuan earthquake. The results show that the simulated coseismic electric fields can fit the observed electric signals well in both arrival time and amplitude, suggesting that the MI effect is a possible mechanism for the generation of the observed electric signals. The simulated magnetic fields are 1 order of magnitude weaker in amplitude than the observed magnetic data, implying that the observed magnetic fields are mainly generated by other mechanisms.
A Satellite‐Based Lagrangian Perspective on Atlantic Water Fractionation Between Arctic Gateways
Authors: Broomé S. , Chafik L. , Nilsson J.
Published: October 2021

Warm Atlantic Water reaches the Arctic Ocean via two gateways: the Barents Sea Opening (BSO) and Fram Strait. Here, we study the near‐surface flow of the Atlantic Water in the Nordic Seas and its fractionation between these Arctic gateways, using simulated Lagrangian trajectories based on satellite altimetry for 1994–2018. Lagrangian particles are released in the eastern Nordic Seas, where Atlantic Water flows poleward in two current cores: an inner branch along the Norwegian Continental Slope and an outer sea ward branch. The trajectories toward Fram Strait and the BSO are, in an averaged sense, largely steered by the bottom topography, and on inter‐annual timescales we find an anticorrelation in the number of particles that reach the two gateways. Most of the particles released in the inner branch enter the Barents Sea and most of the particles seeded in the outer branch reach Fram Strait. However, there is a significant cross‐over of particles from the outer to the inner branch in the Lofoten Basin, and nearly half of the total number of particles entering the BSO originate in the outer branch. This cross‐over is accomplished solely by the time‐fluctuating part of the velocity field, and it becomes stronger when the eddy kinetic energy in the Lofoten Basin is anomalously high. Thus, the outer branch may, via processes in the Lofoten Basin, be important for Barents Sea climate variability.
Detection of Microorganisms and Metabolism in Dune Sand of a Low Organic Content
Authors: Rychert Krzysztof , Wink Lisa , Blohs Marcus , Kumpitsch Christina , Neumann Charlotte , Moissl‐Eichinger Christine , Wielgat‐Rychert Magdalena
Published: October 2021

The main goal of astrobiological studies is the search for life beyond Earth. Developing life detection methods requires test locations that have similar environmental conditions to extraterrestrial sites or that simply have low organism abundances. In this study, we describe dune sand of a low organic matter content (0.11%) collected from a national park frequented by few people. It is located in temperate zone. We hypothesized that dune sand is characterized by the low abundance of microorganisms and metabolic rates that could be compared to analogs of extraterrestrial environments like the Antarctic McMurdo Dry Valleys or the Atacama Desert. Measurements of CO2efflux and ATP concentration demonstrated that hydrating dune sand with sterile distilled water initiated a short period of substantial microbial metabolic activity that lasted from 4 to 5 days. The maximum CO2efflux was 100 mgCO2 m−2 d−1, which was low compared to values reported for sandy dunes, deserts and poor soils, including McMurdo Dry Valleys. Microscopic observations demonstrated that the abundance of prokaryotic microorganisms in the dune sand was low at roughly one million per cm3of sand and was comparable to the abundance reported from the Atacama Desert. The microbial communities in the dune sand were studied based on 16S rRNA gene analyses. The most prominent bacterial genera wereMassiliaandBacillus. Study demonstrated that dune sand sampled from a national park area was as useful for testing life detection methods as are other well‐established analogs of extraterrestrial environments.
Advancing Artificial Neural Network Parameterization for Atmospheric Turbulence Using a Variational Multiscale Model
Authors: Janssens M. , Hulshoff S. J.
Published: October 2021

Data‐driven parameterizations offer considerable potential for improving the fidelity of General Circulation Models. However, ensuring that these remain consistent with the governing equations while still producing stable simulations remains a challenge. In this paper, we propose a combined Variational‐Multiscale (VMS) Artificial Neural Network (ANN) discretization which makes no a priori assumptions on the model form, and is only restricted in its accuracy by the precision of the ANN. Using a simplified problem, we demonstrate that good predictions of the required closure terms can be obtained with relatively compact ANN architectures. We then turn our attention to the stability of the VMS‐ANN discretization in the context of a single implicit time step. It is demonstrated that the ANN parameterization introduces nonphysical solutions to the governing equations that can significantly affect or prevent convergence. We show that enriching the training data with nonphysical states from intra‐time step iterations is an effective remedy. This indicates that the lack of representative ANN‐induced errors in our original, exact training inputs underpin the observed instabilities. In turn, this suggests that data set enrichment might aid in resolving instabilities that develop over several time steps.
A Comparison of the Topside Electron Density Measured by the Swarm Satellites and Incoherent Scatter Radars Over Resolute Bay, Canada
Authors: Larson B. , Koustov A. V. , Kouznetsov A. F. , Lomidze L. , Gillies R. G. , Reimer A. S.
Published: October 2021

Electron density measured at high latitudes by the Swarm satellites is compared with the measurements by the RISR incoherent scatter radars as the satellites fly by the radars' field of views near Resolute Bay, Canada between 2014 and 2019. More than 200 satellite passes crossing multiple radar beams are considered. Overall, the Swarm‐based electron densities are smaller than those measured by the radars by ∼30%. The values are closer to one another at electron densities between and , corresponding to plasma frequencies between 1.5 and 3.5 MHz. Swarm‐measured values are getting progressively smaller than those measured by radars at larger electron densities/plasma frequencies. For the entire range of measured electron densities, the slope of the best fit linear line to the data expressed in terms of electron density is ∼0.62 and offset is . Stronger differences between the instruments were found for observations at nighttime and dawn.
Quantifying Dam‐Induced Fluctuations in Streamflow Frequencies Across the Colorado River Basin
Authors: Hwang Jeongwoo , Kumar Hemant , Ruhi Albert , Sankarasubramanian Arumugam , Devineni Naresh
Published: October 2021

Periodic fluctuations in natural streamflow are a major driver of river ecosystem dynamics and water resource management. However, most U.S. rivers are impacted both by long‐term hydroclimatic trends and dams that alter flow variability. Despite these impacts, it remains largely unexplored how dams affect the dominant frequencies of natural streamflow over a highly regulated river network. We investigated the entire Colorado River Basin (CRB) to understand how the annual (10–14 months) and multi‐annual (24–60 months) frequencies in natural flow regimes have been progressively altered by dams. Given the significant alteration over the CRB, we captured changes in streamflow frequencies between naturalized and observed monthly flows via wavelet analysis. Based on the similarity of changes in streamflow frequencies (annual and multi‐annual) over the last 30 years, sections of the riverine network were classified into four groups. The annual frequency was relatively well preserved downstream of Hoover Dam, while showing a systematic trend of alteration downstream of Glen Canyon Dam until Hoover Dam. Meanwhile, the multi‐annual frequency component was highly altered for the entire Lower Colorado main stem (i.e., downstream of Glen Canyon). We also identified dams with significant impacts on streamflow frequency by comparing wavelet coherence estimates. This study advances the notion that dams fundamentally alter river flow regimes across multiple frequencies and with varying amplitudes over time and space, with alteration propagating – or being dampened – by both hydroclimatic fluctuations and water resource management.