bluuebunny/crossref_metadata_2025_split huggingface dataset:
Staffing many‐server queues with autoregressive inputs
Authors: Sun Xu , Liu Yunan 
Published: November 2020

AbstractRecent studies reveal significant overdispersion and autocorrelation in arrival data at service systems such as call centers and hospital emergency departments. These findings stimulate the needs for more practical non‐Poisson customer arrival models, and more importantly, new staffing formulas to account for the autocorrelative features in the arrival model. For this purpose, we study a multiserver queueing system where customer arrivals follow a doubly stochastic Poisson point process whose intensities are driven by a Cox–Ingersoll–Ross (CIR) process. The nonnegativity and autoregressive feature of the CIR process makes it a good candidate for modeling temporary dips and surges in arrivals. First, we devise an effective statistical procedure to calibrate our new arrival model to data which can be seen as a specification of the celebrated expectation–maximization algorithm. Second, we establish functional limit theorems for the CIR process, which in turn facilitate the derivation of functional limit theorems for our queueing model under suitable heavy‐traffic regimes. Third, using the corresponding heavy traffic limits, we asymptotically solve an optimal staffing problem subject to delay‐based constraints on the service levels. We find that, in order to achieve the designated service level, such an autoregressive feature in the arrival model translates into notable adjustment in the staffing formula, and such an adjustment can be fully characterized by the parameters of our new arrival model. In this respect, the staffing formulas acknowledge the presence of autoregressive structure in arrivals. Finally, we extend our analysis to queues having customer abandonment and conduct simulation experiments to provide engineering confirmations of our new staffing rules.
Migration cost optimization for service provider legacy network migration to software‐defined IPv6 network
Authors: Dawadi Babu R. , Rawat Danda B. , Joshi Shashidhar R. , Manzoni Pietro , Keitsch Martina M. 
Published: November 2020

SummaryThis paper studies a problem for seamless migration of legacy networks of Internet service providers to a software‐defined networking (SDN)‐based architecture along with the transition to the full adoption of the Internet protocol version 6 (IPv6) connectivity. Migration of currently running legacy IPv4 networks into such new approaches requires either upgrades or replacement of existing networking devices and technologies that are actively operating. The joint migration to SDN and IPv6 network is considered to be vital in terms of migration cost optimization, skilled human resource management, and other critical factors. In this work, we first present the approaches of SDN and IPv6 migration in service providers' networks. Then, we present the common concerns of IPv6 and SDN migration with joint transition strategies so that the cost associated with joint migration is minimized to lower than that of the individual migration. For the incremental adoption of software‐defined IPv6 (SoDIP6) network with optimum migration cost, a greedy algorithm is proposed based on optimal path and the customer priority. Simulation and empirical analysis show that a unified transition planning to SoDIP6 network results in lower migration cost.
Consensus‐based and extremum seeking methods for distributed generalized nash equilibrium
Authors: Shao Guangru , Wang Rui , Wang Xue‐Fang , Liu Kun‐Zhi 
Published: November 2020

AbstractThis article investigates the generalized Nash equilibrium (GNE) seeking for the game with equality constraints. Each player cannot directly access all the other player's actions and the gradients of all players' payoff functions are unknown. In these scenarios, an interesting question is under what distributed algorithm the GNE can be found. To address such games, we first design a two‐time‐scale distributed algorithm based on the extremum seeking method and consensus protocol. Then, by utilizing singular perturbation techniques and Lyapunov robust analysis, we show that the players' decisions can be regulated to an arbitrarily small neighborhood of the GNE. Moreover, we further consider the ideal case in which the gradients are known. In this case, the proposed strategy can be degenerated to a gradient‐based algorithm and the players' decisions exponentially converge to the GNE. Finally, two examples along with simulation results are used to illustrate the effectiveness of the proposed algorithms.
Effect of micro‐sized marble dust on mechanical and thermo‐mechanical properties of needle‐punched nonwoven jute fiber reinforced polymer composites
Authors: Sharma Ankush , Choudhary Mahavir , Agarwal Pankaj , Biswas S. K. , Patnaik Amar 
Published: November 2020

AbstractThis work explores effectiveness of marble dust as a filler in needle‐punch nonwoven jute fiber reinforced polymer composites, prepared through vacuum‐assisted resin transfer molding process. Four different particulate filled composites are fabricated by varying the filler percentage from 0 to 24 wt% at an interval of 8 wt% marble dust under the controlled environment. The mechanical characterizations such as flexural strength, interlaminar shear strength, compressive strength, and impact strength enhanced with the increase in filler wt% in the composite. The improvement rate is observed from 14% to 33% compared to the unfilled composite. However, for tensile strength is concerned with the increase in filler content in the composites, the strength shows declined in order irrespective of filler content. This study also focuses on high‐temperature applications, for that dynamic mechanical analysis is performed in a three‐point bending mode with 1 Hz frequency as a function of temperature. Similarly, in case of fracture toughness of the proposed composites, the fracture toughness increases approximately from ≈22%, 27% and 59% respectively over unfilled composite with the change in filler percentage. Simultaneously, numerical simulation for fracture toughness is also performed and compared with experimental results. The deviation is found in the range from 0% to 4% with R2 value of 0.984. Based upon the outcome of present results, this research work can be subsequently extended for the low‐grade housing applications in one end and at the same time, optimal waste utilization can also be possible to reduce the environmental waste.
Dual factor mental health model: Validation through mixture modeling and cut scores
Authors: Thayer Andrew J. , Weeks Mollie R. , Cook Clayton R. 
Published: November 2020

AbstractThe dual‐factor model (DFM) of mental health affords educators an expanded view of student social–emotional and behavioral functioning and may help identify students in need of school‐based mental health services who would otherwise go unnoticed with traditional screening methods. With a focus on integrating subjective well‐being into the conceptualization of mental health, the DFM may be one paradigm to aid in supporting students. However, without greater clarity regarding accurate and feasible methods of measuring student functioning and grouping behaviors into the DFM, schools may not be able to utilize this strategy within broader multi‐tiered systems of support. As such, this study explores the stability of the DFM categories over the course of one school year and compares student grouping using theoretically‐informed cut‐score analysis and empirically informed mixture modeling. Results indicate that data may be best represented by different types of DFM latent groups over the course of one school year and may have little congruence with cut‐score methods of categorization. Implications for the utility of the DFM for providing a comprehensive picture of school‐wide mental health are discussed.
New economics of transnational living
Authors: Erdal Marta Bivand , Carling Jørgen 
Published: November 2020

AbstractThis article unpacks what constitutes the economics of transnational living. We situate this concept among literatures on economic transnationalism, transnational livelihoods, and transnational social protection but argue that it merits a new conceptual foundation. The first part of this foundation is the definition of “transnational living” as sustained and similarly significant attachments, interactions, and presences in two or more societies separated by national borders. The other half is “the economics of” transnational living, which we understand as the economic choices and relationships that motivate, condition, or result from such a way of life. We combine the conceptual development with empirical analysis of interviews with a diverse set of people who lead transnational lives within Europe or between Europe and other parts of the world. In this material, the economics of transnational living is constituted by six overlapping spheres: livelihoods, housing, mobility, social protection, legal matters, and brokerage.
Human mesenchymal stromal cells do not express ACE2 and TMPRSS2 and are not permissive to SARS-CoV-2 infection
Authors: Avanzini Maria A. , Mura Manuela , Percivalle Elena , Bastaroli Francesca , Croce Stefania , Valsecchi Chiara , Lenta Elisa , Nykjaer Giulia , Cassaniti Irene , Bagnarino Jessica , Baldanti Fausto , Zecca Marco , Comoli Patrizia , Gnecchi Massimiliano 
Published: November 2020

Abstract
Anti-inflammatory and immune-modulatory therapies have been proposed for the treatment of COVID-19 and its most serious complications. Among others, the use of mesenchymal stromal cells (MSCs) is under investigation given their well-documented anti-inflammatory and immunomodulatory properties. However, some critical issues regarding the possibility that MSCs could be infected by the virus have been raised. Angiotensin-converting enzyme 2 (ACE2) and type II transmembrane serine protease (TMPRSS2) are the main host cell factors for the severe acute respiratory syndrome-coronavirus 2 (SARS-CoV-2), entry, but so far it is unclear if human MSCs do or do not express these two proteins. To elucidate these important aspects, we evaluated if human MSCs from both fetal and adult tissues constitutively express ACE2 and TMPRSS2 and, most importantly, if they can be infected by SARS-CoV-2. We evaluated human MSCs derived from amnios, cord blood, cord tissue, adipose tissue, and bone marrow. ACE2 and TMPRSS2 were expressed by the SARS-CoV-2-permissive human pulmonary Calu-3 cell line but not by all the MSCs tested. MSCs were then exposed to SARS-CoV-2 wild strain without evidence of cytopathic effect. Moreover, we also excluded that the MSCs could be infected without showing lytic effects since their conditioned medium after SARS-CoV-2 exposure did not contain viral particles. Our data, demonstrating that MSCs derived from different human tissues are not permissive to SARS-CoV-2 infection, support the safety of MSCs as potential therapy for COVID-19.
The emergence and evolution of cognition‐ and affect‐based trust in Russian entrepreneurial ventures
Authors: Lascaux Alexander , Kolesnikova Irina 
Published: November 2020

AbstractResearch SummaryIn this study, we trace the origins and development of attitudes of trust and distrust toward Russian entrepreneurial ventures. Drawing on the results of an in‐depth comparative case analysis, we examine the patterns of cognition‐based and affect‐based trust‐building efforts in Russian entrepreneurial companies and reflect on the outcomes of these efforts at various stages of the firms' life cycle. We demonstrate that trust‐enhancing attempts undertaken by Russian entrepreneurial ventures can lead to a sense of trust or distrust toward entrepreneurial projects, depending upon the firms' initial resource endowment. We also show that trust can substitute for the lack of entrepreneurial resources available to nascent businesses in a transitioning environment. In addition, we present a novel evolutionary framework for the affect‐based trusting attitudes.Managerial SummaryEntrepreneurial firms need to develop trust toward their business projects, particularly among their customers and employees. This is especially important when entrepreneurial ventures strive to achieve their objectives in transitioning economies, which often exhibit hostility and disbelief toward entrepreneurial initiatives. We examine the development of trust and distrust in two Russian entrepreneurial companies working in the private educational sector. We show that entrepreneurial ventures create very different types of trusting and distrusting attitudes among their stakeholders, and their trust‐building efforts are determined by the initial amount of resources available to the companies at the start of their entrepreneurial projects. We compare the outcomes of the firms' efforts to promote trust and make some conclusions important to launching successful entrepreneurial ventures in transitioning economies.
Capacity design for composite partially restrained steel frame‐reinforced concrete infill walls with concealed vertical slits
Authors: Sun Guohua , Hu Yuehua , Gu Qiang , Wang Yixin , Fang Youzhen 
Published: November 2020

SummaryThis paper presents an innovative capacity‐based design procedure that aims to achieve the ideal seismic performance for the composite partially restrained (PR) steel frame‐reinforced concrete (RC) infill wall with concealed vertical slits (PSRCW‐CVS). The proposed method adopts the direct capacity design principles and preselected preferred plastic mechanism such that the RC infill wall undergoes ductile failure prior to the other steel components in the event of a rare‐level earthquake (i.e., earthquake with a 2% probability of exceedance in 50 years). Based on the ultimate resisting capacity of RC infill walls, the free‐body diagrams and simplified design formulae for the surrounding steel components, including the vertical boundary element (VBE), horizontal boundary element (HBE), PR connection, and shear connectors, were proposed. To demonstrate the reasonability of the capacity‐based design procedure, a five‐story PSRCW‐CVS structure was designed according to the proposed design method, followed by a series of nonlinear time history analyses. The overall seismic response of this example was evaluated in terms of story displacement, interstory drift ratio, residual story displacement, and residual interstory drift ratio. The proposed method yielded a more uniform interstory drift ratio distribution along the height of the five‐story PSRCW‐CVS structure. Structural damage was controlled by achieving the preselected preferred plastic mechanism.
Evaluation of vitamin A gut loading in black soldier fly larvae (Hermetia illucens)
Authors: Boykin Kimberly L. , Mitchell Mark A. 
Published: November 2020

AbstractBlack soldier fly (BSF) larvae are potentially an excellent source of calcium for insectivores; however, previous studies have identified that they lack appreciable amounts of fat‐soluble vitamins (A, D3, and E). To make BSF larvae a more complete food item, fat‐soluble vitamins should either be provided via gut loading or with a multivitamin dusting supplement. The purpose of this study is to identify factors associated with gut loading vitamin A into BSF larvae and to develop feeding recommendations for a more consistent gut‐loading process. Factors that were addressed include the vitamin A concentration added to the diet, length of time given to gut load, moisture content of the diet, and density of larvae during feeding. Diets and larvae were analyzed for vitamin A concentration using high‐performance liquid chromatography. Larval vitamin A concentrations increased in a nonlinear fashion with increasing dietary vitamin A. Length of time (F = 150.818, p < .001), moisture content of the diet (F = 41.436, p < .001), and larval density (F = 78.407, p < .001) were all found to be significant factors contributing to the larvae's gut‐loading capacity. On the basis of our results and vitamin A recommendations from the National Resource Council for rats and poultry, gut‐loading recommendations for BSF larvae when fed to insectivorous reptiles and amphibians are as follows: vitamin A concentration of diet between 16,000 and 20,000 mcg retinol equivalents/kg, gut‐loading time period of 24 h, moisture content of the diet approximately 60%, and larval density between 0.1 and 1 larvae per each gram of moist substrate.
Lepton number violating operators with standard model gauge fields: a survey of neutrino masses from 3-loops and their link to dark matter
Authors: Gustafsson Michael , No José Miguel , Rivera Maximiliano A. 
Published: November 2020

Abstract
We investigate neutrino mass generation scenarios where the lepton number breaking new physics does not interact with Standard Model (SM) quarks and couples only to the SM right-handed charged lepton chirality. The lowest-order lepton number violating effective operator which describes this framework is a unique dimension nine operator involving SM gauge fields, $$ {\mathcal{O}}_9 $$

O
9

. We find that there are two possible classes of new physics scenarios giving rise to this $$ {\mathcal{O}}_9 $$

O
9

operator. In these scenarios neutrino masses are induced radiatively via dark matter interactions, linking the dark matter to a natural explanation for the smallness of neutrino masses compared to the electroweak scale. We discuss the phenomenology and existing constraints in the different neutrino mass models within each class. In particular, we analyze the important interplay between neutrino mixing and neutrinoless double β-decay in order to predict characteristic signatures and disfavour certain scenarios.
Finding three-dimensional layouts for crashworthiness load cases using the graph and heuristic based topology optimization
Authors: Beyer F. , Schneider D. , Schumacher A. 
Published: November 2020

AbstractIn this paper we present a new procedure using the graph and heuristic based topology optimization in order to find layouts for three-dimensional frame structures under crash loads. A three-dimensional graph describes the geometry and is used to derive a finite element shell model. The model of the frame structure consists of different profiles with continuous cross-sections. The ends of the profiles are currently rigidly connected. Each cross-section is defined by an individual two-dimensional graph. After performing a simulation its results are used by competing heuristics to propose new topologies for the frame structure. Most of these heuristics are derived from expert knowledge. Over several iterations, the goal is to improve the structures mechanical behavior. Typical objectives are the minimization of the structural intrusion in a crash scenario or the minimization of the maximal contact force between structural components. The presented method includes topology optimization by heuristics and shape optimization respectively sizing by mathematical optimization algorithms. The new flexible syntax for three- and two-dimensional graphs, the optimization process and the currently used heuristics are described. The performance is demonstrated for two examples, each optimized twice with opposing objectives.
Hydrothermal eruption dynamics reflecting vertical variations in host rock geology and geothermal alteration, Champagne Pool, Wai-o-tapu, New Zealand
Authors: Gallagher Anna , Montanaro Cristian , Cronin Shane , Scott Bradley , Dingwell Donald B. , Scheu Bettina 
Published: November 2020

AbstractHydrothermal eruptions are characterised by violent explosions ejecting steam, water, mud, and rock. They pose a risk to tourism and the operation of power plants in geothermal areas around the world. Large events with a severe destructive threat are often intensified by the injection of magmatic fluids along faults and fractures within volcano-tectonic rifting environments, such as the Taupo Volcanic Zone. How these hydrothermal eruptions progress, how craters form and the scale of ejecta impacts, are all influenced by the local geology and reservoir hydrology. By analysing breccia lithology, undisturbed strata proximal to the explosion sites, and conducting tailored decompression experiments, we elucidate the eruption sequence that formed Champagne Pool, Wai-o-tapu, New Zealand. This iconic touristic site was formed by a violent hydrothermal eruption at ~ 700 years B.P. Samples from undisturbed drill cores and blocks ejected in the eruption were fragmented in shock-tube experiments under the moderate pressure/temperature conditions estimated for this system (3–4 MPa, 210–220 °C). Our results show that this was a two-phase eruption. It started with an initial narrow jetting of deep-sourced lithologies, ejecting fragments from at least a 110-m depth. This event was overtaken by a larger, broader, and dominantly shallower eruption driven by decompression of much more geothermal fluid within a soft and porous ignimbrite horizon. The second phase was triggered once the initial, deeper-sourced eruption broke through a strong silicified aquitard cap. The soft ignimbrite collapsed during the second-phase eruption into the crater, to repeatedly choke the explosions causing short-term pressure rises that triggered ongoing deeper-sourced eruptions. The eruption spread laterally also by exploiting a local fault. These results are relevant for hydrothermal eruption hazard scenarios in environments where strong vertical variations in rock strength and porosity occur.
Trends in cerebrospinal fluid leak rates following the extended endoscopic endonasal approach for anterior skull base meningioma: a meta-analysis over the last 20 years
Authors: Zamanipoor Najafabadi Amir H. , Khan Danyal Z. , Muskens Ivo S , Broekman Marike L. D. , Dorward Neil L. , van Furth Wouter R. , Marcus Hani J. 
Published: November 2020

Abstract
Objective
The extended endoscopic approach provides unimpaired visualization and direct access to ventral skull base pathology, but is associated with cerebrospinal fluid (CSF) leak in up to 25% of patients. To evaluate the impact of improved surgical techniques and devices to better repair skull base defects, we assessed published surgical outcomes of the extended endoscopic endonasal approach in the last two decades for a well-defined homogenous group of tuberculum sellae and olfactory groove meningioma patients.

Methods
Random-effects meta-analyses were performed for studies published between 2004 (first publications) and April 2020. We evaluated CSF leak as primary outcome. Secondary outcomes were gross total resection, improvement in visual outcomes in those presenting with a deficit, intraoperative arterial injury, and 30-day mortality. For the main analyses, publications were pragmatically grouped based on publication year in three categories: 2004–2010, 2011–2015, and 2016–2020.

Results
We included 29 studies describing 540 patients with tuberculum sellae and 115 with olfactory groove meningioma. The percentage patients with CSF leak dropped over time from 22% (95% CI: 6–43%) in studies published between 2004 and 2010, to 16% (95% CI: 11–23%) between 2011 and 2015, and 4% (95% CI: 1–9%) between 2016 and 2020. Outcomes of gross total resection, visual improvement, intraoperative arterial injury, and 30-day mortality remained stable over time

Conclusions
We report a noticeable decrease in CSF leak over time, which might be attributed to the development and improvement of new closure techniques (e.g., Hadad-Bassagasteguy flap, and gasket seal), refined multilayer repair protocols, and lumbar drain usage.