Boundary Crossings Research Articles

An individual‐based model trained on multiple data sources estimates population connectivity and facilitates aggregation of harvest management units

Abstract Management boundaries are often delimited by political and social factors, whereas animal movements are affected by ecological and geophysical constraints. Thus, understanding connectivity among distinct management units is of considerable importance, particularly for harvested species, where quotas set in ignorance of connectivity may fail to meet management goals. We constructed an individual‐based model (IBM) to better understand wild turkey movements at large scales, benefiting from multiple data sources that are often available for harvested species. We built an IBM from spring seasonal movements of wild turkey, using data from ringed, radio‐, and GPS‐marked turkeys captured in Maine, USA. Our IBM accommodated variation in individual turkey response to landscape connectivity metrics and identified emergent migratory connectivity dynamics among harvest management regions. We calculated a low degree of connectivity among wildlife management districts (WMD) which, in combination with the substantial number of boundary crossings observed, indicated a more diffuse distribution of turkeys among WMDs. Synthesis and applications: Estimates of turkeys moving between districts provided a clear delineation of where immigration was strongest, identifying which WMDs should be managed as singular population units. This approach has widespread utility for any species or system where harvest management decisions are made at finer spatial scales than the movement dynamics affecting population processes.

Extent of the Magnetotail of Venus From the Solar Orbiter, Parker Solar Probe and BepiColombo Flybys

AbstractWe analyze data from multiple flybys by the Solar Orbiter, BepiColombo, and Parker Solar Probe (PSP) missions to study the interaction between Venus' plasma environment and the solar wind forming the induced magnetosphere. Through examination of magnetic field and plasma density signatures we characterize the spatial extent and dynamics of Venus' magnetotail, focusing mainly on boundary crossings. Notably, we observe significant differences in boundary crossing location and appearance between flybys, highlighting the dynamic nature of Venus' magnetotail. In particular, during Solar Orbiter's third flyby, extreme solar wind conditions led to significant variations in the magnetosheath plasma density and magnetic field properties, but the increased dynamic pressure did not compress the magnetotail. Instead, it is possible that the increased EUV flux at this time rather caused it to expand in size. Key findings also include the identification of several far downstream bow shock (BS), or bow wave, crossings to at least 60 (1 = 6,052 km is the radius of Venus), and the induced magnetospheric boundary to at least 20 . These crossings provide insight into the extent of the induced magnetosphere. Pre‐existing models from Venus Express were only constrained to within 5 of the planet, and we provide modifications to better fit the far‐downstream crossings. The new model BS is now significantly closer to the central tail than previously suggested, by about 10 at 60 downstream.

Managing Unavoidable Boundary Crossings During Treatment

Managing Unavoidable Boundary Crossings During Treatment

Crossing Between Clinical Work and Scholarly Publishing: Early-Career Neurosurgeons as Clinician-Researchers

Medical professionals who assume multiple roles as clinicians and researchers are commonly found in hospitals worldwide. Likewise, in many Chinese hospitals, particularly among early-career medical professionals with MD and PhD degrees, active engagement in both clinical practice and scientific research is expected. In the current ethnographic study, the cultural-historical activity theory is used to explore how three early-career neurosurgeons at a tier-one northern Chinese hospital conduct and write research for publishing in Science Citation Index (SCI)-indexed journals in addition to handling their heavy clinical workload. Drawing on multiple sources of qualitative data, including semi-structured interviews, two-week naturalistic observations, field notes, photographs, and daily activity logs with three neurosurgeons, the study findings highlight Chinese neurosurgeons conduct and write up their research using patient data and collaborating with laboratories while seeking academic language editing and peer feedback. Ethical considerations of clinician-researchers’ scholarly publishing process, implications for researching medical professionals’ boundary crossings, and future research directions are also discussed.

Examining S-T-E-M Teachers’ Design of Integrated STEM Lesson Plans

AbstractReform efforts in different parts of the world call for the adoption of integrated approaches to STEM education. However, little is known about how teachers work, as members of learning communities, to design STEM teaching material such as lesson plans. To address this gap in the literature, we examined the design of STEM lesson plans by in-service secondary teachers (n = 26) from all S-T-E-M disciplinary backgrounds who participated as members of a learning community in the context of a 7-month professional development program comprised of 13 small-group sessions. STEM lesson plans were analysed based on the key characteristics of a conceptual framework of integrated STEM, and the teachers’ identified interdisciplinary elements were analysed through the boundary objects framework. The qualitative content analysis produced four main findings: (a) divergencies take place at the disciplinary level when teachers design STEM lesson plans; (b) teachers coming from different disciplines have different positioning regarding specific integrated STEM key characteristics; (c) the type and sequence of instructional activities served as a boundary-design practice; (d) the nature of the boundary objects that teachers identify in order to teach integrated STEM differs according to the discipline. The findings of the study shed light on teachers’ understanding and needs at the disciplinary level and call for specially designed STEM professional development programmes that provide explicit opportunities for disciplinary boundary crossings.

Structure and dynamics of the Hermean magnetosphere revealed by electron observations from the Mercury electron analyzer after the first three Mercury flybys of BepiColombo

The Mercury electron analyzer (MEA) obtained new electron observations during the first three Mercury flybys by BepiColombo on October 1, 2021 (MFB1), June 23, 2022 (MFB2), and June 19, 2023 (MFB3). BepiColombo entered the dusk side magnetotail from the flank magnetosheath in the northern hemisphere, crossed the Mercury solar orbital equator around midnight in the magnetotail, traveled from midnight to dawn in the southern hemisphere near the closest approach, and exited from the post-dawn magnetosphere into the dayside magnetosheath. We aim to identify the magnetospheric boundaries and describe the structure and dynamics of the electron populations observed in the various regions explored along the flyby trajectories. We derive 4s time resolution electron densities and temperatures from MEA observations. We compare and contrast our new BepiColombo electron observations with those obtained from the Mariner 10 scanning electron spectrometer (SES) 49 years ago. A comparison to the averaged magnetospheric boundary crossings of MESSENGER indicates that the magnetosphere of Mercury was compressed during MFB1, close to its average state during MFB2, and highly compressed during MFB3. Our new MEA observations reveal the presence of a wake effect very close behind Mercury when BepiColombo entered the shadow region, a significant dusk-dawn asymmetry in electron fluxes in the nightside magnetosphere, and strongly fluctuating electrons with energies above 100s eV in the dawnside magnetosphere. Magnetospheric electron densities and temperatures are in the range of 10-30 cm$^ $ and above a few 100s eV in the pre-midnight-sector, and in the range of 1-100 cm$^ $ and well below 100 eV in the post-midnight sector, respectively. The MEA electron observations of different solar wind properties encountered during the first three Mercury flybys reveal the highly dynamic response and variability of the solar wind-magnetosphere interactions at Mercury. A good match is found between the electron plasma parameters derived by MEA in the various regions of the Hermean environment and similar ones derived in a few cases from other instruments on board BepiColombo.

ANALYSIS OF THE BIFURCATING DUCT OF AN INLET PARTICLE SEPARATOR IN TRANSONIC FLOW CONDITIONS

Abstract To increase the reliability of turboprop and turboshaft engines in extreme operating conditions, filtering protections such as Inlet Particle Separators (IPS) can be installed at the intake. The flow inside an IPS is highly 3D and unsteady, with fluctuations especially pronounced when transonic conditions are reached. In this paper, we aim at providing the transonic analysis of an industrial IPS designed for aerodynamic lab testing. As a first step, we define the threshold beyond which sonic conditions are reached in the boundary cross sections of the IPS by means of a 1D semi-empirical model. Second, we select a critical configuration, and we perform CFD simulations to analyze the locations and evolution of the transonic flow inside the IPS. Different models are presented, i.e. steady and unsteady Reynolds-Averaged Navier-Stokes, Detached Eddy Simulation and Large Eddy Simulation, characterized by three levels of resolution. The results show the evolution of some transonic shocks: the steady-state model is only providing information on averaged quantities, while the time-resolved simulations offer a more precise overview in the time domain. The analysis in the frequency domain reveals the frequencies of the transonic fluctuations. Finally, we discuss three alternative designs to effectively improve the operating range and mitigate the risks related to the transonic instabilities, comparing the differences in separation efficiency with respect to the baseline case. The results prove that the optimal design choice is given by the trade-off between operating range, pressure losses and separation efficiency.

Martian bow shock and magnetic pileup boundary models based on machine learning

Traditional Martian bow shock and magnetic pileup (magnetopause) boundary models are based on the fitting of free parameters in a prescribed formula. The form of the formula, fitted data, and considered controlling parameters distinguish the individual models from each other. However, all these models have one thing in common: the shape of the boundary and the parametric dependence assumed are fixed by the prescribed formula. The fitted data set typically consists of individual identified boundary crossings. This approach can suffer from a significant bias, as the boundary crossings are more likely to be identified in regions where a spacecraft spends more time. In this study, we use an automated region classification of the data measured by the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft to solar wind, magnetosheath, or magnetosphere. This is achieved by applying the Support Vector Machine method to individual spacecraft half-orbits (from periapsis to apoapsis or vice versa). Two different models of the locations of the bow shock and magnetic pileup boundaries are then constructed based on neural networks: i) a model trained using the classified data, and ii) a model trained using individual identified boundary crossings. As compared to formal empirical modeling efforts, the neural network models do not assume any prescribed shape/distance formula. Optimal model parameterization (considering the solar wind dynamic pressure, solar ionizing flux, crustal magnetic field magnitude, Alfvén Mach number, and interplanetary magnetic field magnitude) is discussed and the model performance evaluated.

Border-Crossing Experience in Refugee Tales IV

The year 2021 witnessed the publication of the latest volume of Refugee Tales, which chronologically coincided with the seventieth anniversary of the adoption of the 1951 Refugee Convention by the UK and other countries. This collection is the fourth volume of the Refugee Tales Project, which began in 2015 with a yearly meeting to walk and share stories by victims of detention, with the main goal of abolishing indefinite detention in the UK. The Refugee Tales Project, which exposes the humanitarian crisis involved in displacement, refugeehood, and detention, is primarily a spatial project that is concerned with borders and boundary crossings. The centrality of space can be seen reflected in the stories collected in Refugee Tales IV, which also reveal a sustained interest in the dimension of time. In this context, the present study addresses borders and border-crossing in the literary voicing of migrants’ experience as these migrants interact with spatial and temporal planes, with the aim of exploring such an interaction in a selection of narratives from Refugee Tales IV. This analysis examines the selected tales from the perspectives of the treatment of space, time, and the disoriented perception of both, considering how the articulation of these parameters contributes to the exposure of the injustices in detention and refugeehood.

Book Review: Boundaries, Boundary Crossings, and Boundary Violations

Book Review: Boundaries, Boundary Crossings, and Boundary Violations

Doctoral Students Balancing the Roles and Relationships of Counselor Education

Aspiring counselor educators in Council for Accreditation of Counseling & Related Educational Programs (CACREP)-accredited programs must learn to be counselors, teachers, supervisors, researchers, and leaders. These roles can overlap, creating multiple complex relationships during their programs. To examine these roles, we conducted a constructivist grounded theory investigation of how counselor education doctoral students (n = 9) balanced multiple roles and relationships and boundary crossings. We utilized chain referral sampling and continued until we reached theoretical saturation. We used semi-structured interviews conducted via videoconferencing (Zoom) for data collection and coded the interviews using two main phases: an initial phase and a focused coding phase. We used member checks by sending participants preliminary findings for feedback. The resulting theory describes two distinct stakeholders in the management of the multiple roles and relationships in counselor education: the students and the program. Students were responsible for balancing roles and responsibilities while considering professional growth, ethics, and boundary setting. The program was responsible for providing a growth-fostering environment and mentorship. Ultimately, the process of navigating multiple roles and relationships (MRRs) involves early discussion of MRRs, intentionality of program placement, assistance with boundaries and ethical decisions, and exposure to remediation and gatekeeping.

Rate-induced tipping in ecosystems and climate: the role of unstable states, basin boundaries and transient dynamics

Abstract. The climate system as well as ecosystems might undergo relatively sudden qualitative changes in the dynamics when environmental parameters or external forcings vary due to anthropogenic influences. The study of these qualitative changes, called tipping phenomena, requires the development of new methodological approaches that allow phenomena observed in nature to be modeled, analyzed and predicted, especially concerning the climate crisis and its consequences. Here we briefly review the mechanisms of classical tipping phenomena and investigate rate-dependent tipping phenomena which occur in non-autonomous systems characterized by multiple timescales in more detail. We focus on the mechanism of rate-induced tipping caused by basin boundary crossings. We unravel the mechanism of this transition and analyze, in particular, the role of such basin boundary crossings in non-autonomous systems when a parameter drift induces a saddle-node bifurcation in which new attractors and saddle points emerge, including their basins of attraction. Furthermore, we study the detectability of those bifurcations by monitoring single trajectories in state space and find that depending on the rate of environmental parameter drift, such saddle-node bifurcations might be masked or hidden, and they can only be detected if a critical rate of environmental drift is crossed. This analysis reveals that unstable states of saddle type are the organizing centers of the global dynamics in non-autonomous multistable systems and as such need much more attention in future studies.

Tracking Magnetopause Motion Using Cold Plasmaspheric Ions

AbstractWe demonstrate that any plasmaspheric/cold ions accelerated in the vicinity of the magnetopause boundary, can proxy the local magnetopause motion over many minutes. The timeseries of this motion capture local structures such as waves on the boundary. We determine cold ion velocities normal to full magnetopause boundary crossings for three events with varying distances to the predicted reconnection X‐line, thus, providing a proof‐of‐concept study demonstrating the potential for using cold ion velocities to track magnetopause motion over a long period of time. Obtaining the time history of the (local) motion of the magnetopause relative to the spacecraft is determined by integrating the bulk (<100 eV for H+) ion velocities normal to the boundary. Timeseries of these tracked cold ion accelerations may be used to investigate boundary layer thicknesses, potential wave structures on the magnetopause, and their evolution beyond the boundary crossing. This method generally tracks magnetopause motion out to distances of ∼1–2RE away from the spacecraft during quasi‐steady space weather conditions.

Psychoanalysts Online: Media regulation and digital boundary crossings

Objectives: The present explorative study evaluates the question of media regulation in treatment and the question of psychoanalysts' experiences with digital crossings of boundaries. Methods: Using a self-constructed questionnaire, N = 50 completed questionnaires were distributed to psychoanalysts (age: M = 48,64, SD = 12,71; m = 44 %, f = 56 %) at the 51st IPA Congress held in July 2019 that were analyzed using aMann-Whitney U-test and Chi square test. Results: The majority of the psychoanalysts surveyed 68 %, (n = 34) do not regularly discuss the use ofmedia with their patients at the beginning of treatment, 28%(n = 14) of the analysts surveyed contacted their patients using digital media services without discussing this possibility of contact beforehand, 16 % (n = 8) contacted their patients at night, 46 %, n = 23 googled their patients and 24 %, (n = 12) secretly used a mobile phone during analysis. Conclusions: Due to the advancing technology of the health care system, further psychoanalytic research that accompanies the process of using media in treatment is necessary.

Crossing borders and crossing the line

ABSTRACT In 1989, the Malaysian music group, Search, were a popular culture phenomenon across the Nusantara, successfully exporting their Malaysian brand of hard rock and heavy metal retrospectively termed rock kapak (lit. axe rock). Their success set the stage for cross-border collaboration in Indonesia, which included recordings, tours and a feature-length film. In 1992, the group was subject to a long hair ban that restricted broadcast of their music on television and radio in Malaysia. As a result of their defiance of the ban, the band’s live performances in the country were denied permits. This study conceptualises the connections and contestations mobilised by Malay rock as a crossing of nation-state borders and a crossing of moral boundaries. The former is viewed in inter-regional popular culture exchanges within the Nusantara region, while the latter is analysed in terms of Malay rock’s defiance to authoritarian moral policing. The boundary crossings of Search signify the musical mobilities of Malay rock, read as an informal cross-Nusantara ‘movement’ of mostly male, working-class youth who challenged conservative ethno-national states. While Search’s mobility across the region clearly represents a porous crossing of domestic and regional borders, it was the affectively ‘moving’ aspects of their ballads that appealed to a wide demographic of Nusantara audiences and the politicians that were complicit in controlling their public image.

Dalit Theology, Boundary Crossings and Liberation in India: A Biblical and Post-colonial Study, written by Jobymon Skaria

Dalit Theology, Boundary Crossings and Liberation in India: A Biblical and Post-colonial Study, written by Jobymon Skaria

Being a 'good' doctor: Understanding and managing professional boundaries is challenging and can lead to stress and burnout.

The aim is to increase the understanding of non-sexual boundary challenges and potential personal and professional impacts on doctors and medical students. We examined peer-reviewed and grey literature and published commentary and cases from Australian health practitioner boards and medico-legal insurance companies. Key ideas relating to the objective of our study were subsequently framed into a narrative. Compared to 'sexual' boundary crossings, the literature examining 'non-sexual' boundaries is scanty, fragmented, and difficult to find. There are gaps in knowledge around the prevalence and consequences of non-sexual boundary challenges and crossings, although the safety and wellbeing of health professionals and patients are of concern. Non-sexual boundary crossings may represent a 'slippery slope' to boundary violations. Opportunities for doctors and medical students to access relevant training appear limited. We identified several categories of boundary challenges based on context, the nature of the existing relationship, and the type of behaviour. Non-sexual boundary challenges may be related to stress, burnout, and risk for future boundary violations. Future research to investigate the impacts on doctors and medical students in maintaining professional boundaries in their relationships with patients and colleagues, their specific training needs, and the effectiveness of training in reducing work-related stress and burnout is needed.

Current ethical dilemmas experienced by therapists who use social media: A systematic review

AbstractBackgroundDespite the rise in therapist use of social media, current ethical guidelines have not provided clear guidance on how to use social media. Ethical guidelines commonly suggest therapists apply the same ethical principles advised for their offline work, without thorough consideration of differing potential ethical dilemmas online.MethodsA systematic review was conducted to explore the main ethical dilemmas encountered by therapists who use social media. Three databases were searched: PsycINFO, Web of Science and CINAHL Plus. A total of 52 studies were screened by their titles and abstracts, with a subsequent 36 studies analysed against inclusion and exclusion criteria. The remaining 14 studies were assessed using quality standards and included within the thematic synthesis.FindingsData analysis conceptualised three themes: therapist searches risking the therapeutic relationship with subthemes of loss and trust and power imbalance; therapist defensiveness in response to client searches with subthemes of self‐disclosure and self‐protection; and societal normalisation of social media with subthemes of familiarity and ease and blurred boundaries.ConclusionThe societal prevalence of social media use suggests it is now inevitable that therapists will experience some form of ethical dilemma regarding social media. Therapists need an awareness of how online searches for clients may impact the therapeutic relationship. The risk of boundary crossings from clients online can be minimised through increased privacy settings and reflexivity on what therapists self‐disclose online. Ethical dilemmas on social media should be discussed in supervision, with further guidance needed for the ethical use of social media as a therapist.

Dramaturgical boundary crossings in William Baldwin’s Beware the Cat as a text for theatrical adaptation

ABSTRACT This article argues that William Baldwin’s Beware the Cat is an already intensely theatrical text, prior to any form of dramatic adaptation. This proposition, and an exploration of how these concerns are subtly and playfully taken up by Babbage, Stenner and O'Connor's 2018 stage adaptation, is the focus of the essay. I anchor my discussion in the logic and discourses of dramaturgical practice and analysis to offer a reading that addresses the role of artifice, spectatorship, materiality, embodiment, textuality and narrative in the work and its interest in the makerly processes through which animal and human identities are constructed, assigned and negotiated. I propose that Beware the Cat, in both textual and live form, explores and negotiates three kinds of dramaturgical boundary crossings – between text and performance, between matter and meaning, and between performer and spectator. Overall, I propose that the titular ‘beware’ acts as a form of dramaturgical instruction for working with the text in a live context. I argue that, because Baldwin’s original work is so strikingly theatrical in its themes and structure, it offers a set of principles for the process of the work’s theatrical adaptation as much as it invites a reworking of its content for another form.

Developing a boundary crossing learning trajectory: supporting engineering students to collaborate and co-create across disciplinary, cultural and professional practices

ABSTRACT The competence to work together and co-create with others outside one’s own scientific domain, culture or professional practice is a critical competence for engineers to respond to global challenges. In this context, boundary crossing (BC) competence is crucial. We reflect on a university-wide participatory action research educational innovation project for developing and implementing BC in its education, draw conceptual and practical lessons learned and identify success factors. The BC theory and its four learning mechanisms (identification, coordination, reflection, transformation) are introduced and we argue that they provide a solid foundation for BC competence development in courses and curricula. We show that BC can relatively easy be implemented in existing education, yet it is crucial to use experiential types of learning to make this rather abstract concept tangible for both teachers and students. Two key lessons learned for developing BC education are to see BC competence as a generic competence and boundaries as learning opportunities.