bluuebunny/crossref_metadata_2025_split huggingface dataset:
Una teología gótica sureña: Flannery O’Connor y su concepción religiosa de la novela
Authors: Poggi Alfredo Ignacio 
Published: July 2020

Mary Flannery O’Connor, a menudo considerada una de las mejores escritoras norteamericanas del siglo XX, parece haber respaldado la existencia de la “novela católica” como género particular. Este artículo muestra las características descritas por O’Connor sobre este género, puntualizando la constitución indefinida y problemática de dicha delimitación. Independientemente de la imposibili dad de definir el término, este artículo sostiene además que la explicación de O’Connor sobre el género trasciende el campo literario y muestra una visión distintiva de la fe cristiana y una teología sofisticada que denomino “gótico sureño”. La teología de O’Connor comienza con un realismo que cuestiona el yo cartesiano moderno, sacramentalidad que impregna la realidad inmediata y lo grotesco que interactúa con el misterio divino. La teología de O’Connor señala que las creencias cristianas se basan en narraciones, no en conceptos abstractos, e interactúa específicamente con el Sur de Estados Unidos, mostrando el misterio que reside en lo grotesco y aguardando con esperanza la llegada violenta de la gracia divina.
Numerical Simulation of a Counter-Rotative Open Rotor Using Phase-Lagged Conditions: Initial Validation on a Single Rotor Case
Authors: Fiore Maxime , Biolchini Romain 
Published: July 2020

Abstract
This paper presents the large Eddy simulation (LES) of a propeller representative of the first rotor of a counter rotative open rotor (CROR) configuration based on a multiple frequency phase-lagged approach in conjunction with a proper orthogonal decomposition (POD) data storage. This method enables to perform unsteady simulations on multistage turbomachinery configurations including multiple frequency flows with a reduction of the computational domain composed of one single blade passage for each row. This approach is advantageous when no circumferential periodicity occurs in the blade rows of the configuration and a full 360 deg simulation would be required. The data storage method is based on a POD decomposition replacing the traditional Fourier series decomposition (FSD). The inherent limitation of phase-shifted periodicity assumption remains with POD data storage but this compression method alleviates some issues associated with the Fourier transform, especially spectrum issues. The paper is first dedicated to compare the flow field obtained with the LES with phase-lagged condition against full-matching URANS, LES simulations, and experimental data available around the blade and in the wake of the rotor. The study shows a close agreement of the phase-lagged LES simulation with other simulations performed and a thicker wake compared with the experiments with lower turbulent activity. The analysis of the losses generated in the configuration, based on an entropy formulation and a splitting between boundary layer and secondary flow structures, shows the strong contribution of the blade boundary layer in the losses generated.
Performance Improvement of Turbofans by Electric Power Transfer
Authors: Balaghi Enalou Hossein , Bozhko Serhiy 
Published: July 2020

Abstract
With design trends toward the more electric engine (MEE) for the more electric aircraft (MEA), novel technologies can be pinpointed for multi-spool engines. Provided that a multi-spool MEE is equipped with electrical machines connected to each of its shafts, using power electronic converters (PECs) within a common high-voltage DC bus configuration, it is possible to redistribute a desired amount of power between the engine shafts independent of their speeds. This paper presents the impact of electric power transfer (EPT) on engine performance by using a developed 0-dimensional engine model based on the inter-component volume (ICV) method and engine component maps. Generic component maps are scaled to match the design point of the CFM56-3 engine. Validating the simulation results with engine performance data from literature shows that the steady-state error of the speed and fuel consumption is within 1% and 3.5% for the high- and low-speed settings, respectively, which is acceptable for the purpose of power transfer studies. It is shown that a 400 kW EPT system is the best performing for the cases run for the CFM56-3 engine, which can halve the amount of bleed air from variable bleed valves (VBVs). Results show that EPT with the rescheduled VBVs opening improves the engine performance significantly at low-speed settings by decreasing fuel consumption and increasing surge margins. Detailed simulation results from the engine model and EPT weight penalty analysis show that fuel consumption for short- and medium-haul flights reduces by up to 0.46% and 0.79% with state-of-the-art, and 0.60% and 1.0% with future technologies, respectively. Furthermore, results show that electric power transfer can recover the surge margins of degraded engines at high-speed settings.
High Dimensional Matching Optimization of Impeller–Vaned Diffuser Interaction for a Centrifugal Compressor Stage
Authors: Qin Ruihong , Ju Yaping , Galloway Lee , Spence Stephen , Zhang Chuhua 
Published: July 2020

Abstract
The matching and interaction between the impeller and vaned diffuser is the most important aerodynamic-coupling between the components of a high-speed centrifugal compressor. Many research studies have been carried out during the last decade, both experimentally and numerically, on the flow mechanisms underlying impeller–vaned diffuser matching and interaction, with the aim of achieving a high-performance stage. However, the published work lacks any study that optimizes the matching of the impeller–vaned diffuser components in the environment of a full compressor stage due to two unresolved issues, i.e., identifying an effective matching optimization strategy and the high dimensional nature of the problem. To tackle these difficulties, four different optimization strategies (i.e., (1) integrated, (2) single component, (3) parallel, and (4) sequential optimization strategies) have been proposed and validated through a high dimensional matching optimization of the Radiver compressor test case published by the Institute of Jet Propulsion and Turbomachinery at Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen University. Particular attention has been paid to the slope of the diffuser total pressure ratio characteristic near the surge point to further extend the stage surge margin. The results showed that the integrated optimization strategy was the most effective one for achieving good matching of the impeller–vaned diffuser interaction due to its inherently strong coupling optimization. Compared with the baseline compressor, the optimized stage achieved a gain of 1.2% in total-to-total isentropic efficiency at the peak efficiency point as well as a predicted 26.17% increase in stable operating range. For the stage examined in this study, a fore-loaded design of impeller blade as well as an increased vane angle for the diffuser vane was beneficial to the impeller–vaned diffuser matching. The more uniform spanwise distributions of the impeller discharge flow angle and the diffuser vane incidence presented the opportunity for a more optimized matching of the flow field between the 3D impeller and the 2D vaned diffuser. The outcomes of this work are particularly relevant for the advanced design of high-speed centrifugal compressors.
Out in the Field Versus Inside in the Lab: A Comparison of Design Professionals’ Concept Screening Practices
Authors: Zheng Xuan , Miller Scarlett R. 
Published: July 2020

AbstractConcept screening is one of the gatekeepers of innovation process and thus is considered a vital component of engineering design. Yet, we know very little about how decisions are made during concept screening or the factors that inform these decisions. This is due, in part, to the fact that most prior work on concept screening in engineering design has focused on student populations or on industry professionals in an experimental setting which is not indicative of the risks and consequences professionals face in their daily work—particularly when it comes to innovative design process. Thus, the current study was developed to identify how the environmental settings (i.e., experimental versus naturalistic) and the role of the professionals in the design process (i.e., idea generators versus executives) impacts the criteria used to screen design ideas. Two studies were conducted including a workshop study with 45 design professionals from two companies in an experimental setting and a participatory ethnographic study with seven design professionals from a small electromechanical company in a naturalistic setting. The results showed stark differences in the criteria used to screen ideas between naturalistic and experimental practices and between idea generators and company executives. In addition, the results showed differences in the factors considered during concept screening between naturalistic and experimental environments. These results are used to identify opportunities for tools and methods that encourage the consideration of creative ideas in the engineering design industry and encourage appropriate risk-taking in engineering design.
Effect of Electric Current Pulse Type on Springback, Microstructure, Texture, and Mechanical Properties During V-Bending of AA2024 Aluminum Alloy
Authors: Mohammadtabar Nafiseh , Bakhshi-Jooybari Mohammad , Gorji Hamid , Jamaati Roohollah , Szpunar Jerzy A. 
Published: July 2020

AbstractThe present work focused on the effect of the electric current pulse type on the springback, microstructure, texture, and mechanical properties during the V-bending process of AA2024 aluminum alloy. In order to investigate this effect, three different forming conditions including conventional V-bending and electrically assisted V-bending with square and sinusoidal pulses were considered. The results indicated that the amount of springback significantly decreased from 45.5 deg (for the sample formed via conventional V-bending) to 24 deg by applying the sinusoidal pulse. Microstructural observations revealed lower stored energy in the samples formed by electric current pulses which resulted in larger grain size compared with the samples formed without electric pulses. In addition, the result showed that the intensity of the 〈111〉||BLD (bend line direction) fiber texture reduced after applying electric current pulses, whereas it was very strong in the sample formed without electric pulses. It was suggested that the electric current pulses led to change the slip plane of the dislocations from {111} to {110} through cross slip. The applying electric current pulses decrease the ultimate tensile strength (UTS) from 471.1 MPa (for the conventional tensile test) to 448.0 and 426.7 MPa for the square and sinusoidal pulses, respectively. On the other hand, the electric pulses improved the formability of the AA2024 alloy owing to the activation of more slip systems, inhibition of dislocation pinning, the promotion of dislocation movement, and the acceleration of restoration mechanisms.
Progress Toward Modeling and Optimization of Sustainable Machining Processes
Authors: Jawahir I. S. , Schoop J. , Kaynak Y. , Balaji A. K. , Ghosh R. , Lu T. 
Published: July 2020

AbstractThe topic of sustainable machining has in recent times emerged as a significant and impactful area of research focus as it directly deals with environmental health and protection, economic growth and prosperity, and societal wellbeing with greater health and wellness. More specifically, sustainable machining at product, process, and system levels deals with reducing negative environmental impact, offering improved energy and resource efficiency, generating a minimum quantity of wastes, providing operational safety, and offering improved personal health. This paper summarizes recent efforts by the world research community in sustainable machining with a systematic approach for the analysis of machining processes that are broadly classified as sustainable, beginning with dry machining, and then near-dry (also known as minimum quantity lubrication (MQL)) and cryogenic machining processes. The paper also extends its analysis to a hybrid mode of sustainable machining that effectively combines cryogenic and MQL machining processes for improved productivity and machining performance. While a significant part of this paper presents experimental analysis, the progress being made in modeling and optimization has also been discussed in the paper. In particular, major challenges involved in model development for practical implementation, with a view to selecting optimum cutting conditions and cutting tool selection, are primarily discussed in the paper. The need for continued modeling efforts for achieving deployable optimized conditions for sustainable machining is highly recognized, and further research is required in numerous fronts integrating the various convergent disciplines such as materials, mechanics, computational sciences, economics, environmental sciences.
Oblique Wave Scattering by a Floating Bridge in the Presence of a Vertical Permeable Flexible Barrier
Authors: Gayathri R. , Kar P. , Behera H. , Sahoo T. 
Published: July 2020

Abstract
The interaction between oblique water waves and floating bridge in the presence of a vertical partial flexible permeable barrier is studied under the assumption of the linear water wave theory in finite water depth. The associated mathematical problem is handled for a solution using the least-squares approximation method. The reflection and transmission coefficients, free surface elevation, wave force acting on the bridge and barrier are computed to study the effects of various wave and structural parameters for three different edge conditions. The study reveals that wave reflection decreases with an increase in porosity, and a reverse pattern is found in the case of wave transmission. As the normalized spacing between the barrier and the floating bridge increases, the reflection coefficient follows a periodically oscillatory pattern. Furthermore, it is noticed that regardless of the barrier configurations, the wave reflection increases for an increase in the angle of incidence. It is also found that the surface-piercing barrier is more efficient than the bottom-standing barrier as a wave barrier. Moreover, the results indicate that by placing a porous flexible barrier at an appropriate position, the wave force on the bridge can be reduced significantly.
Methodology for the Assessment and Optimization of Connection Parameter Combinations for Modular Floating Structures
Authors: Zhang Yuming , Liu Haixiao 
Published: July 2020

Abstract
To obtain an optimum connection parameter combination for modular floating structures of multiple functions, an integrated methodology for the assessment and optimization is proposed in the present work, out of consideration for the balance between the functional performance and economic effect. To illustrate the whole process, two types of modular floating structures, i.e., a modular wave energy converter (WEC) and a modular mobile offshore base (MOB), are taken as the cases. For the two cases, connection configurations are first specified based on structural functions as well as environment conditions; then, quantified measurements are established and studied, based on which the following process of selection of optimization algorithms is done and the optimum solutions are obtained, making up a whole process of specification of the connection parameter combination for modular floating structures. The proposed methodology possesses the potential of offering guidance for the phase of preliminary design of connection structures of modular floating structures.
Efficient Passage-Spectral Method For Unsteady Flows Under Stall Conditions
Authors: Romera David , Corral Roque 
Published: July 2020

AbstractThis paper presents an efficient method of approximating unsteady flows using a block-wise discrete spatial Fourier series for the modeling of three-dimensional non-axisymmetric flows without making any hypothesis about its temporal periodicity. The method aims at capturing the long-wavelength flow patterns that are present in many unsteady problems of industrial interest, such as compressor stability, with a drastic reduction in computational resources. The method is intended to be used to compute flows exhibiting large-scale instabilities and where the fundamental frequency of the problem is not known beforehand. The approach discretizes the domain using a finite number of blocks or passages, where the flow variables at the supposedly periodic boundaries are continuously updated using the spatial Fourier coefficients of a uniformly spaced set of reduced-passage domains. The NASA rotor 67 under the effect of distorted inflow conditions has been used as verification case to demonstrate the effectiveness and viability of the method. The comparison between the passage-spectral method and the full-annulus solution shows that sound solutions can be obtained with a low number of harmonics. The new method has also been applied to investigate the rotating stall inception of the NASA rotor 67 for distorted inlet flows near stall operating conditions. The method is shown to accurately reproduce the full-annulus solution with a few spatial harmonics, capturing the characteristic features of the complex flow induced by the tip leakage vortex breakdown. The computational cost in this application has been reduced by a factor of between three and seven. This number heavily depends on the ratio between the number of retained harmonics to the number of blades.
Online supplementation for teaching evidence-based medicine: feasibility of a randomised-controlled trial
Authors: McCall Marcy C , Fanshawe Thomas R , McCartney David , Young Damion , Nunan David , Heneghan Carl 
Published: July 2020

Background and Objectives
As teaching technology advances, medical education is increasingly using digital mediums and exploring instructional models such as the flipped classroom and blended learning courses, where the in-class taught sessions are more groups on content delivered before class. Early evidence suggests lectures and foundational material can be equally provided online, but we have low-quality research to be convinced. We aim to test and develop an online evidence-based teaching resource that seeks to improve the availability and scalability of evidence-based medicine (EBM) learning tools. We evaluate the feasibility of a study design that could test for changes in academic performance in EBM skills using an online supplement.

Methods
Mixed-methods feasibility study of a randomised controlled trial (RCT) in an undergraduate medical student cohort.

Results
Of a small cohort (n=34), eight participants agreed to randomisation and completed the study. No study participant completed the EBM supplementary course in full. Students report time-management as a significant barrier in participation, and all aspects of the study and communications should be delivered with efficiency a key consideration.

Conclusion
Randomising students to an online EBM supplement within a medical school programme presents challenges of recruitment and student motivation, but the study design is potentially feasible.
Longitudinal association between near-misses/minor injuries and moderate/severe injuries in industrial settings by presence/absence of depressive symptoms in a nationally representative sample of workers in Japan
Authors: Yamauchi Takashi , Takahashi Kunihiko , Suka Machi , Sasaki Takeshi , Takahashi Masaya , Yoshikawa Toru , Okoshi Hiroto , Umezaki Shigeo , Yanagisawa Hiroyuki 
Published: July 2020

ObjectivesThe association between near-misses/minor injuries and moderate/severe injuries has yet to be investigated longitudinally. This study aimed to examine the longitudinal association between near-misses/minor injuries and moderate/severe injuries by the presence/absence of depressive symptoms using 1-year follow-up data obtained from a nationally representative sample of workers in Japan.MethodsOf the 18 231 eligible participants at time 1 (T1), 12 127 who responded to the 1-year follow-up survey at time 2 (T2) (response rate: 66.5%; 4370 females and 7757 males; mean age (SD), 45.3 (10.5) years) were included in the analysis. Multivariate logistic regression analyses were performed with the presence/absence of moderate/severe injuries at T2 as the dependent variable.ResultsIn total, 36.4% of participants reported depressive symptoms at T1. During the follow-up period, 1.6% of participants reported moderate/severe injuries in industrial settings. After adjusting for relevant variables, participants who reported near-misses (OR=1.7 (95% CI, 1.3 to 2.4)) and minor injuries (OR=2.5 (95% CI, 1.3 to 4.7)) at T1 were more likely to have moderate/severe injuries at T2 compared to those who reported no near-misses/minor injuries. However, this association was stronger in participants who did not have depressive symptoms at T1 than in those who had depressive symptoms.ConclusionsWhile the predictive value of near-misses/minor injuries for the occurrence of moderate/severe injuries by the presence/absence of depressive symptoms should be cautiously interpreted, our findings suggest that the development and utilisation of near-miss/minor injury reporting systems may help reduce the likelihood of moderate/severe injuries among workers, especially those without depressive symptoms.
Case of multiple myeloma with cutaneous involvement and aberrant CD3 expression
Authors: Schiavo Luca , Di Palma Stefano , Verganti Sara 
Published: July 2020

SUMMARYA six‐year‐old golden retriever presented for a fast‐growing mass at the level of the left mandibular area. Cytological evaluation was consistent with an anaplastic round cell neoplasm. CT scan and abdominal ultrasound showed the presence of a large mass affecting the left mandibular salivary gland, several subcutaneous nodules and generalised intra‐abdominal lymphadenomegaly. The mandibular mass was surgically removed, and histopathology and immunohistochemistry were compatible with plasma cell tumour with aberrant CD3 expression. Complete staging led to the diagnosis of multiple myeloma with skin and salivary gland involvement. After receiving one dose of vincristine, the dog was started on melphalan/prednisolone protocol. After initial improvement, the dog showed signs of progressive disease and was euthanased 35 days after starting treatment due to severe clinical deterioration. Postmortem examination showed infiltration by neoplastic cells in several organs including the heart, the conjunctiva and some abdominal organs.
Stability analysis for cosmological models in f(T, B) gravity
Authors: Franco Geovanny A. Rave , Escamilla-Rivera Celia , Levi Said Jackson 
Published: July 2020

AbstractIn this paper we study cosmological solutions of the f(T, B) gravity using dynamical system analyses. For this purpose, we consider cosmological viable functions of f(T, B) that are capable of reproducing the dynamics of the Universe. We present three specific models of f(T, B) gravity which have a general form of their respective solutions by writing the equations of motion as an autonomous system. Finally, we study its hyperbolic critical points and general trajectories in the phase space of the resulting dynamical variables which turn out to be compatible with the current late-time observations.