Critical Boundary Research Articles

Reframing Our Relationship to Work Trauma

This era has shed light on gross inequities and racialized trauma in various work environments; bringing clarity to the dire need for individuals to create healthy boundaries and prioritize self-compassion. Through this commentary, the author seeks three outcomes: (1) to define and understand racialized work trauma, (2) to identify the difference between individual and organizational accountability therein, and (3) to give some guidance on individual practices that help create critical boundaries and healing in one’s work life. Guiding questions are as follows: What is racialized work trauma? How does it manifest? What are quick fixes for fostering boundaries? What are some practical solutions to protecting one’s psyche?

Исторические нарративы и репрезентации войны в коллективной памяти сообществ Рунета: темпоральные траектории и семантические сети

The article analyses the collective representation of war narratives in the Russian social network VKontakte in the context of the problems of national self-consciousness and national identity. The material for the study was extracted by automated methods using the VKontakte open API. It amounts to 332,781 unique posts from open historical communities from January 1, 2020 to May 9, 2022. Using the PolyAnalyst platform, the authors found out that the word “war” is the most frequent and most significant (the metric takes into account the average frequency of a word in all texts) in this text collection. A sample of texts with the word “war” (49,736 posts) was subjected to additional analysis with a set of NLP methods to study key narratives and semantic connections. The theoretical and methodological basis of the study is the principles and approaches of modern narratology and the history of memory. The analysis of social media big data has confirmed that the dramatic historical fate of Russia, as a natural consequence of the factors of vast territory, extended borders, and abundance of natural resources, has shaped the mentality of Russians to be always ready for war. Thematic clustering of texts has confirmed the dominance of the practices of commemoration of the Great Patriotic War, reflected the etatism and etacratism of the Russian consciousness, demonstrated public attention to representations of war in art and science, and discovered the “trench truth” block and its place in the collective war representations. Narratives are often rich in details and facts, pragmatism, prosaic and rationalism. Empirical material confirms that the 20th century certainly occupies a special significance in the memory of Russians about wars. The authors comment on the rating of references to wars in the studied text collection and indicate the opposition of the Great Patriotic War to the Second World War, and the Patriotic War of 1812 to the Napoleonic Wars of the early 19th century. Some attention is also given to the issues of information wars in the modern world. The presented war narrative is of interest as the foundation of the “collective imaginary”, on the basis of which the prospects and critical boundaries of the image of the future are constructed.

BESS based voltage stability improvement enhancing the optimal control of real and reactive power compensation

<abstract> <p>With the increase in the integration of renewable energy resources in the grid and ongoing growth in load demand worldwide, existing transmission lines are operating near their loading limits which may experience voltage collapse in a small disturbance. System stability and security can be improved when the closeness of the system to collapse is known. In this research, voltage stability of IEEE 30 bus test network is analyzed and assessed under continuously increasing load condition, utilizing the Critical Boundary Index (CBI); and improved with continuous integration of battery energy storage system (BESS). BESS is considered to be a hybrid combination of storage units and voltage source converter to have a controllable real and reactive power output. Security constraint optimal power flow is utilized for optimally sizing the installed BESS. It is evident from the outcome of the research that the voltage stability of the system is controlled to be above the acceptable range of 0.3 pu CBI in all lines and the system voltage is kept within the acceptable and constrained range of 0.9–1.1 pu.</p> </abstract>

Synergistic partners: How HRM and leadership climate shape employees’ ambidextrous behavior

Recent advancements in ambidexterity research suggest that HRM plays a vital role in shaping contextual ambidexterity. Building on social information processing theory, the present study extends this literature by putting the spotlight on two fundamental, yet often implicit assumptions of contextual ambidexterity. First, we examine how HRM practices that are specifically designed to promote ambidextrous cues (i.e., ambidexterity-oriented HRM [A-HRM] practices) are related to contextual ambidexterity. Second, we address the premise that such HRM practices actually affect all employees in an organization. In addition, we introduce transformational leadership (TFL) climate as a critical boundary condition that helps to translate paradoxical signals of A-HRM practices to the employees. We tested these relationships in a multi-source sample of 16,740 employees from 94 organizations and found support for the proposed interaction effect of A-HRM and TFL climate on employees’ ambidextrous behavior and, in turn, organizational performance (i.e., indirect effects). Our study contributes to a better understanding of creating contextual ambidexterity and the important role of leaders in the implementation of A-HRM practices.

On critical nonlinear boundary problems for p-harmonic functions on Riemannian manifolds

In this paper, we are concerned with the nonlinear boundary problem with critical Sobolev trace growth for p-harmonic functions on compact Riemannian manifolds with smooth boundary. We prove these equations possess a nontrivial solution .

Burnout among neurology residents during the COVID-19 pandemic: a national cross-sectional study.

BackgroundNeurology residents are particularly vulnerable to burnout because of the novel logistical and clinical challenges brought about by the coronavirus disease 2019 (COVID-19) pandemic. Despite its implications, knowledge on burnout and its predictors among neurology residents is lacking. This study aimed to determine the prevalence of burnout among neurology residents during the pandemic, to compare burnout subscale scores and sociodemographic and work characteristics, and to explore residents’ perceptions on how to address burnout.MethodsWe conducted a cross-sectional survey among all 120 residents from the nine institutions in the Philippines offering neurology residency programs from March to August 2020. We obtained sociodemographic and work characteristics using questionnaire. We measured burnout using the Maslach Burnout Inventory. We performed an inductive thematic analysis to analyze perceptions on how to reduce burnout.ResultsThe response rate was 71.67% (86/120). The mean age was 30.1 ± 3.1 years. Using predefined subscale critical boundaries, the prevalence of burnout was 94% (95% CI 89, 99). The lack of compensation and number of on-duty days influenced emotional exhaustion scores. The number of on-duty days influenced depersonalization scores. Thematic analysis revealed five themes: increasing manpower; self-care; reducing clerical tasks; improving work environment; and adequate compensation.ConclusionsThe prevalence of burnout among neurology residents during the COVID-19 pandemic was alarmingly high. Reforms in hiring policies, work-hour management, manpower organization, work environment, and logistics may be considered.Supplementary InformationThe online version contains supplementary material available at 10.1007/s10072-021-05675-4.

Elliptic problems in the half-space with nonlinear critical boundary conditions

Elliptic problems in the half-space with nonlinear critical boundary conditions

Aeroelastic analysis of symmetric and non-symmetric trapezoidal honeycomb sandwich plates with FG porous face sheets

In this paper, the aeroelastic analysis of both symmetric and non-symmetric trapezoidal sandwich plates with various boundary conditions in supersonic airflow is studied. The trapezoidal sandwich plate is composed of an orthotropic honeycomb core and two functionally graded (FG) porous face sheets. The fluid structure interaction equations of the sandwich plates under supersonic airflow are derived based on the first-order shear deformation theory (FSDT) and first-order piston theory. Using the Hamilton's principle, the governing equations of motion and the associated boundary conditions are derived in the Cartesian coordinates. Then, applying a transformation of coordinates, the partial differential equations of motion and the associated boundary conditions are converted from Cartesian coordinates into new computational coordinates. The transferred partial differential equations of motion and the associated boundary conditions are discretized by using the generalized differential quadrature (GDQ) method and solved using the state space method. Consequently, the influences of geometry of hexagonal cells in the honeycomb core, porosity, power-law index, geometry of trapezoidal plates, boundary conditions and bending effects of honeycomb core on the critical flutter aerodynamic pressure and stability boundaries of trapezoidal sandwich plates are studied in detail.

Analysis of wind-driven rain characteristics acting on building surfaces in Shanghai based on long-term measurements

Wind-driven rain (WDR) is a critical boundary condition for the thermal and moisture coupling calculations of buildings, and understanding its distribution patterns on facades helps to better design building envelope structures and reduce humidity-induced problems. Given that WDR research in China is limited to a small number of numerical simulations, with field measurement data especially lacking, long-term and high-time resolution WDR measurements on a building module were launched in Shanghai. This research aimed to explore the WDR characteristics of building facades under meteorological conditions in the Shanghai region and compare the accuracy of existing semi-empirical models of WDR through measurements. The results show that when the angle between the inflow wind direction and the vertical direction of the wall facade increased, the WDR capture ratio decreases, and the increases in rainfall amount and wind speed contributed to an increase in WDR amount. The measurement relative errors had a negative exponential relationship with the WDR amount in this research. Compared to non-rainy conditions, the temperature during rainfall was 4.0–5.6 °C lower, and relative humidity was 9.8–21.8% higher. WDR results were compared with two semi-empirical models, which indicated that the ISO model was 0.5–0.8 times that of the measured values, while the ASHRAE model was 1.3–2.4 times greater. The collected data can provide a valuable and unique reference for WDR semi-empirical models and computational fluid dynamics simulation validation in China.

Body type as a risk factor for progress of severe pancreatitis

Relevance. Early detection of severe forms of acute pancreatitis remains an unsolved problem of urgent surgery.Objective of the study: early detection of prognostically unfavorable forms of the disease based on the constitutional characteristics of the patient.Materials and methods. A comparative prospective analysis of the clinical course of acute pancreatitis in 270 patients with an assessment of the prognostic significance of clinical, instrumental and anthropological data in the early diagnosis of severe forms of acute pancreatitis was carried out. In 179 patients there was a moderate and severe form of the disease, in 91 patients the disease was mild.Results and discussion. ROC analysis of the studied criteria showed that clinical and laboratory data on the first day of the disease are not reliable predictors of the risk of death. The somatotype and the amount of adipose tissue in the body (type of nutrition) showed a significant predictive value of AUC (0.768 and 0.655, p < 0.01 and p < 0.05, respectively). At the same time, only the body type AUC (0.658, p < 0.0001) showed statistical reliability as a significant prognostic factor for the progress severity of the patient's condition. The criti cal boundary calculated value of the somatotype is 20 nominal units. The risk group includes persons with a body type close to brachymorphic.Conclusion. Carrying out somatotyping with the calculation of its numerical values, attributing the patient to a particular type of physique in the group of patients with acute pancreatitis in the early stages from the moment of the disease, is an additional criterion for early prediction of the course of acute pancreatitis and will allow to determine the competent treatment to avoid manifestation of severe form of disease.

Bad time to be humble! When and why leaders should not be humble

PurposeAlthough leader humility is generally considered a positive leadership behavior, this study aims to examine when the positive influences of leader humility are likely weakened.Design/methodology/approachData were collected from a two-wave survey. Ordinary least squares regression analyses were conducted to test the hypotheses.FindingsAlthough leader humility is positively related to perceived leader support, this relationship is weakened when the environment is uncertain, resulting in comparatively lower follower performance.Practical implicationsLeaders should be aware that environmental constraints may weaken the desired outcomes of humility and therefore adapt leadership to situational needs.Originality/valueContrasting to predominant research on leader humility, this study examines a critical boundary condition by which its positive influences are compromised. In light of the disruption caused by the ongoing COVID-19, this study suggests that what usually are considered positive characteristics of leader humility are likely perceived as little leader support when the environment is uncertain. Findings of this study echo contingency leadership theories, which suggest that effective leadership should be context-dependent.

Individualized Determination of the Mechanical Fracture Environment After Tibial Exchange Nailing-A Simulation-Based Feasibility Study.

Non-union rate after tibial fractures remains high. Apart from largely uncontrollable biologic, injury, and patient-specific factors, the mechanical fracture environment is a key determinant of healing. Our aim was to establish a patient-specific simulation workflow to determine the mechanical fracture environment and allow for an estimation of its healing potential. In a referred patient with failed nail-osteosynthesis after tibial-shaft fracture exchange nailing was performed. Post-operative CT-scans were used to construct a three-dimensional model of the treatment situation in an image processing and computer-aided design system. Resulting forces, computed in a simulation-driven workflow based on patient monitoring and motion capturing were used to simulate the mechanical fracture environment before and after exchange nailing. Implant stresses for the initial and revision situation, as well as interfragmentary movement, resulting hydrostatic, and octahedral shear strain were calculated and compared to the clinical course. The simulation model was able to adequately predict hardware stresses in the initial situation where mechanical implant failure occurred. Furthermore, hydrostatic and octahedral shear strain of the revision situation were calculated to be within published healing boundaries—accordingly the fracture healed uneventfully. Our workflow is able to determine the mechanical environment of a fracture fixation, calculate implant stresses, interfragmentary movement, and the resulting strain. Critical mechanical boundary conditions for fracture healing can be determined in relation to individual loading parameters. Based on this individualized treatment recommendations during the early post-operative phase in lower leg fractures are possible in order to prevent implant failure and non-union development.

Dynamic Voltage Stability Assessment in Remote Island Power System with Renewable Energy Resources and Virtual Synchronous Generator

Increasing the proportion of renewable energy generations in remote island power systems is becoming essential for realizing decarbonized society. However, since inverter-connected renewable energies have different generation characteristics from conventional generators, the massive penetration can adversely affect system stability. In particular, fault events in such weak remote systems can cause fast voltage collapse, and there is a need to assess dynamic voltage stability. This study attempts dynamic voltage stability assessment using the critical boundary index (CBI) and investigates the impact of the virtual synchronous generator (VSG) on dynamic voltage stability. A remote island power system and VSG are modeled, and time-domain simulations are conducted with case studies of fault events. The simulation results show the potential of CBI to use for dynamic voltage stability assessment. Furthermore, the VSG can provide suitable power output during fault events and improve dynamic voltage stability.

Can we live within environmental limits and still reduce poverty? Degrowth or decoupling?

Can we live within environmental limits and still reduce poverty? Degrowth or decoupling?

An online tripping index to improve microgrid dynamic stability based on estimating critical boundary area

This paper presents an online index for adaptive protection of microgrids concerning the low inertia concept. A three-step approach is developed to consider two offline and online environments, and the proposed scheme is designed. In Step - 1 , a comprehensive study of the microgrid dynamical model is investigated through two different distributed energy resources (DERs), including generator-based and inverter-based resources. In this step, based on the low-inertia concept, a dynamical model of an adaptive protection scheme is proposed through a set of non-model-based indexes. In Step-2 , considering online evaluations of produced indexes, two different equations are provided in the form activation point and triggering point which the corresponding adaptive protective zones are provided. In this step, considering different operational and topological points of microgrid, the protective abilities of proposed indexes are validated and reorganized. Finally Step-3 concentrates on the ability of the proposed defensive scheme in real-time operating mode. In this step, considering different fault scenarios, the accuracy estimation and fast detection of the developed protection scheme are investigated, and the microgrid dynamic security is evaluated. Results present the effectuality of the proposed scheme to fast and secure detection of unstable scenarios using adaptive non-model-based signals concerning different system structures.

A Method of Demarcating Critical Failure Impedance Boundary of Multi-Infeed HVDC Systems Based on Minimum Extinction Angle

A method of rapidly demarcating the critical commutation failure (CF) region of a multi-infeed high-voltage direct-current (HVDC) system is proposed. Based on the nodal impedance matrix and nodal voltage interaction factor, for different AC fault conditions—both balanced and unbalanced—a method of calculating the extinction angles of converters in multi-infeed HVDC systems is deduced in detail. First, the extinction angles of convertor stations under single-phase, double-phase, and three-phase ground faults and line-to-line faults occurring at any bus in an AC system are calculated. The minimum extinction angle serves as a CF criterion. If the calculated extinction angle for a certain bus is smaller than the minimum extinction angle, then a fault at that bus will cause CF of the HVDC system and put that bus into a failed bus set. The critical failure impedance boundaries of the topology diagram can therefore be demarcated by examining every bus in the AC system. The validity and accuracy of the proposed index and the method were verified by calculation results based on the three-infeed HVDC system model of the IEEE 39-bus system. Finally, the critical failure impedance boundary was demarcated in the IEEE 118-bus system to demonstrate the application in a wider range of systems.

Innokenty Annensky: the poet’s appearance

The topic of the article places it within the overlapping boundaries of literary criticism, the history of 19th-c. men’s suits, and memoirs.The methodology of the study involved comparing all contemporary descriptions of I. Annensky’s appearance with his photographs as well as Parisian fashion magazines with articles on men’s fashion, in particular, on collars and neckties; it was mostly these items of his wardrobe that caught the eye of the people who wrote about Annensky. And if it seems that descriptions like ‘overly ceremonious’ and ‘old-fashioned’ begin to dominate the memoirs, it is not because of Annensky alone but rather that, instead of recording what they saw with their own eyes, their authors tend to engage in a dialogue protracted in time and defined by contradictions, concessions and repetitions. The scholar concludes that, not only in his poetry but also in appearance, Annensky was a direct successor of the French poètes maudits with their dandyism. Interestingly, there was no contradiction between Annensky’s poetry and dandyism and his bureaucratic airs; in fact, dandyism and the Decadent fondness for beautiful artefacts perfectly coexisted with the distinguished public office of this Tsarskoe Selo resident.

Spontaneous symmetry breaking in free theories with boundary potentials

Patterns of symmetry breaking induced by potentials at the boundary of free O(N)O(N)-models in d=3- \epsilond=3−ϵ dimensions are studied. We show that the spontaneous symmetry breaking in these theories leads to a boundary RG flow ending with N - 1N−1 Neumann modes in the IR. The possibility of fluctuation-induced symmetry breaking is examined and we derive a general formula for computing one-loop effective potentials at the boundary. Using the \epsilonϵ-expansion we test these ideas in an O(N)\oplus O(N)O(N)⊕O(N)-model with boundary interactions. We determine the RG flow diagram of this theory and find that it has an IR-stable critical point satisfying conformal boundary conditions. The leading correction to the effective potential is computed and we argue the existence of a phase boundary separating the region flowing to the symmetric fixed point from the region flowing to a symmetry-broken phase with a combination of Neumann and Dirchlet boundary conditions.

Stability analysis of the milling process of the thin floor structures

Existing studies on analyzing the chatter problem in the milling process of the thin floors only included the dynamic responses of the cutter and the thin floors, however, the static lateral bending defections of the cutter also have actual effect on the stability of the process. This article develops a dynamic model to study the stability of the thin floor milling process by comprehensively considering the multi-flexibilities from both the static bending defections and the dynamic responses. The instantaneous dynamic chip thickness, which is required in the dynamic model, is analytically derived in the three-dimensional space by fully considering the following two factors. One is the bending effect induced by the static and dynamic deflections of the cutter in the X- and Y-directions, and the other is the tensing-compressing effect originated from the dynamic defections of the cutter and the workpiece in the Z-direction. At the same time, based on the substructure and sensitivity analysis theories, the in-situ dynamic parameters of the in-process floor, i.e. the natural frequency and the modal shape, are theoretically formulated by well combining the change of the cutter position with the removal of material. Based on the above derivations, the dynamic cutting forces together with the dynamic governing equation of the milling system are mathematically formulated, and then, the stability of the thin floor milling process is analyzed through solving the critical stability boundary. Finally, a series of milling tests are conducted on a typical thin floor structure to experimentally validate the accuracy and reliability of the proposed model.

Proactive personality and employee outcomes: The moderating role of team autonomy

We used self-determination theory to investigate the effects of proactive personality on employees' work engagement and helping behavior, as well as the moderating role of team autonomy in this relationship. Twowave data were collected from 75 sales teams (75 team leaders and 464 team members) from a large private company in South China. Multilevel path model analysis was used to test our hypotheses. The impact of proactive personality was amplified in teams with a higher level of team autonomy. Our findings not only provide empirical support for self-determination theory, but also contribute to the proactive personality literature by revealing the critical boundary condition of the effectiveness of proactive personality. Theoretical and practical implications are discussed.