bluuebunny/crossref_metadata_2025_split huggingface dataset:
A pH‐Tailored Anodic Deposition of Hydrous RuO2 for Supercapacitors
Authors: Lin Jun , Xu Youlong , Wang Jie , Zhang Baofeng , Li Liang , Wang Xinzhi , He Shengnan , Zhu Jianbo 
Published: July 2019

AbstractA pH‐tailored anodic deposition strategy is reported in this work, by which the hydrous ruthenium oxide (RuO2) can be directly deposited on titanium (Ti) substrates. The prepared RuO2 electrode exhibits a well kinetic performance (the remarkably low equivalent series resistance of Res∼2 mΩ and charge transfer resistance of Rct∼0.11Ω) and a high specific capacitance of 756 F g‐1 at 0.6 A g‐1. More importantly, a symmetric supercapacitor based on the RuO2 electrode delivers a high specific energy of 24 Wh kg‐1 at 150 W kg‐1. Even at a large specific power of 26.25 kW kg‐1, specific energy is still as high as 8.6 Wh kg‐1, meanwhile achieving a long lifespan of 98% retention over 100,000 cycles. All of these distinguishing properties not only enable the prepared RuO2 to be an excellent electrode material for high‐power output and long life supercapacitors, but also indicates that the pH‐tailored anodic deposition strategy reported in this work is effective to prepare high‐performance RuO2 electrode.
Dealing with revered past: Historical identity statements and strategic change in Japanese family firms
Authors: Sasaki Innan , Kotlar Josip , Ravasi Davide , Vaara Eero 
Published: July 2019

AbstractResearch SummaryThis paper examines how strategy‐makers attempt to reconcile change initiatives with organizational values and principles laid out long before, still encased in strategic identity statements such as corporate mottos and philosophies. It reveals three discursive strategies that strategy‐makers use to establish a sense of continuity in time of change: elaborating (transferring part of the content of the historical statement into a new one), recovering (forging a new statement based on the retrieval and re‐use of historical references), and decoupling (allowing the co‐existence of the historical statement and a contemporary one). By so doing, our study advances research on uses of the past, establishes important linkages between identity and strategy research, and enhances our understanding of the intergenerational transfer of values in family firms.Managerial SummaryCrafting a new corporate philosophy or mission statement can help implement strategic change, but can also be experienced as a disruption in people's sense of “who we are” as an organization. This paper reveals a variety of strategies that managers can use to deal with the tension between promoting change and maintaining a sense of continuity with a distant, revered past. By doing so, it helps managers confronting these issues deal with the enabling and constraining effects of the past. While this is a more general challenge for organizations with historical legacies, it is a particularly delicate issue for family firms grappling with the need to transfer values from one generation to the next, while retaining flexibility to change and adapt over time.
Problemistic search distance and entrepreneurial performance
Authors: Angus Ryan W. 
Published: July 2019

AbstractResearch SummaryThis paper seeks to extend the problemistic search literature by investigating how far entrepreneurial organizations seeking to improve their chances for success should search, depending on their level of past performance. Drawing on a novel data set from the Google Play app store, the paper finds support for its hypothesis that past performance moderates the relationship between search distance and subsequent performance. As past performance increases, the less beneficial (and potentially more harmful) nonlocal search becomes. While the majority of app developers choose a nonlocal search strategy in response to low first app performance, this is rarely the best choice. Instead, the highest second app performance outcomes are associated with moderate search distances that fall between local and nonlocal extremes.Managerial SummaryThis paper uses a large data set obtained from the Google Play app store to explore the following question: when a nascent app developer's first app performs poorly, how different should its second app be? By comparing the text descriptions of developers' first and second apps, the paper is able to show that as the performance of a first app increases, the more harmful it becomes to make a very different second app. Only at extremely low levels of first app performance is it beneficial for developers to make second apps that are very different from their first apps. In all other cases, making second apps that are moderately different—rather than very similar or very different—is associated with the highest second app performance.
Disentangling the microfoundations of acquisition behavior and performance
Authors: Meyer‐Doyle Philipp , Lee Sunkee , Helfat Constance E. 
Published: July 2019

AbstractResearch SummaryThe acquisition literature has highlighted that both firm‐level and manager‐level factors shape acquisition outcomes, yet little is known about their relative contribution. We conduct a variance decomposition analysis to explore the contribution of CEO‐level versus firm‐level factors to acquisition behavior and performance. We also extend the methodology of variance decomposition in strategic management research by employing Poisson multi‐level models, and deriving the percentage of variance attributable to each level in a four‐level model. Although CEO and firm effects both explain a substantial share of the variance in acquisition behavior, the CEO‐effect is notably larger. CEO‐level factors also drive a large portion of the variance in acquisition performance. Overall, our study contributes to the literatures on acquisitions and variance decomposition, and has implications for dynamic capabilities.Managerial SummaryHow much do firm‐level factors and CEO‐level factors matter for explaining acquisition behavior and acquisition performance? This question is not only relevant for researchers but also for practitioners who seek to better understand what drives acquisitions and their outcomes. To help answer this question, our study conducts a variance decomposition analysis of acquisition behavior and acquisition performance. We find that both CEO‐level factors and firm‐level factors explain a substantial portion of the variance in acquisition behavior, but that CEO‐level factors matter relatively more. We also find that CEO‐level factors also explain a substantial portion of the variance in acquisition performance.
Integrating Fluorinated Polymer and Manganese‐Layered Double Hydroxide Nanoparticles as pH‐activated 19F MRI Agents for Specific and Sensitive Detection of Breast Cancer
Authors: Zhang Cheng , Li Li , Han Felicity Y. , Yu Xinying , Tan Xiao , Fu Changkui , Xu Zhi Ping , Whittaker Andrew K. 
Published: July 2019

Abstract19F magnetic resonance imaging (19F MRI) agents capable of being activated upon interactions with cancer triggers are attracting increasing attention, although challenges still remain for precise and specific detection of cancer tissues. In this study, a novel hybrid 19F MRI agent for pH‐sensitive detection of breast cancer tissues is reported, a composite system designed by conjugating a perfluoropolyether onto the surface of manganese‐incorporated layered double hydroxide (Mn‐LDH@PFPE) nanoparticles. The 19F NMR/MRI signals from aqueous solutions of Mn‐LDH@PFPE nanoparticles are quenched at pH 7.4, but “turned on” following a reduction in pH to below 6.5. This is due to partial dissolution of Mn2+ from the Mn‐LDH nanoparticles and subsequent reduction in the effect of paramagnetic relaxation. Significantly, in vivo experiments reveal that an intense 19F MR signal can be detected only in the breast tumor tissue after intravenous injection of Mn‐LDH@PFPE nanoparticles due to such a specific activation. Thus pH‐activated Mn‐LDH@PFPE nanoparticles are a potential “smart” 19F MRI agent for precise and specific detection of cancer diseases.
Lithiumpyridinyl‐Driven Synthesis of High‐Purity Zero‐Valent Iron Nanoparticles and Their Use in Follow‐Up Reactions
Authors: Egeberg Alexander , Block Theresa , Janka Oliver , Wenzel Olivia , Gerthsen Dagmar , Pöttgen Rainer , Feldmann Claus 
Published: July 2019

AbstractThe synthesis of zero‐valent iron (Fe(0)) nanoparticles in pyridine using lithium bipyridinyl ([LiBipy]) or lithium pyridinyl ([LiPy]) is presented. FeCl3 is used as the most simple starting material and reduced either in a [LiBipy]‐driven two‐step approach or in a [LiPy]‐driven one‐pot synthesis. High‐quality nanoparticles are obtained with uniform, spherical shape, and mean diameters of 2.9 ± 0.5 nm ([LiBipy]) or 4.1 ± 0.7 nm ([LiPy]). The as‐prepared, high purity Fe(0) nanoparticles are monocrystalline. In addition to particle characterization (high‐resolution transmission electron microscopy, scanning transmission electron microscopy, dynamic light scattering), composition and purity are examined in detail based on electron diffraction, X‐ray powder diffraction, elemental analysis, infrared spectroscopy, 57Fe Mössbauer spectroscopy, and magnetic measurements. Due to their small size and high purity, the Fe(0) nanoparticles are highly reactive. They can be used in follow‐up reactions to obtain a variety of iron compounds, which is exemplarily shown for the transformation to iron carbide (Fe3C) nanoparticles, the reaction with sulfur to obtain FeS nanoparticles, or the direct reaction with pentamethylcyclopentadiene to FeCp*2 (Cp*: pentamethylcyclopentadienyl).
Large‐Area, Uniform, Aligned Arrays of Na3(VO)2(PO4)2F on Carbon Nanofiber for Quasi‐Solid‐State Sodium‐Ion Hybrid Capacitors
Authors: Mao Zhifei , Wang Rui , He Beibei , Gong Yansheng , Wang Huanwen 
Published: July 2019

AbstractSodium–vanadium fluorophosphate (Na3V2O2x(PO4)2F3−2x, NVPF, 0 ≤ x ≤ 1) is considered to be a promising Na‐storage cathode material due to its high operation potentials (3.6–4 V) and minor volume variation (1.8%) during Na+‐intercalation. Research about NVPF is mainly focused on powder‐type samples, while its ordered array architecture is rarely reported. In this work, large‐area and uniform Na3(VO)2(PO4)2F cuboid arrays are vertically grown on carbon nanofiber (CNF) substrates for the first time. Owing to faster electron/ion transport and larger electrolyte–electrode contact area, the as‐prepared NVPF array electrode exhibits much improved Na‐storage properties compared to its powder counterpart. Importantly, a quasi‐solid‐state sodium‐ion hybrid capacitor (SIHC) is constructed based on the NVPF array as an intercalative battery cathode and porous CNF as a capacitive supercapacitor anode together with the P(VDF‐HFP)‐based polymer electrolyte. This novel hybrid system delivers an attractive energy density of ≈227 W h kg−1 (based on total mass of two electrodes), and still remains as high as 107 Wh kg−1 at a high specific power of 4936 W kg−1, which pushes the energy output of sodium hybrid capacitors toward a new limit. In addition, the growth mechanism of NVPF arrays is investigated in detail.
Potential benefits of polysaccharides derived from marine alga Ulva lactuca against hepatotoxicity and nephrotoxicity induced by thiacloprid, an insecticide pollutant
Authors: Kammoun Intissar , Sellem Imen , Ben Saad Hajer , Boudawara Tahia , Nasri Moncef , Gharsallah Neji , Mallouli Lotfi , Amara Ibtissem Ben 
Published: July 2019

AbstractThe present study aimed to evaluate the potential protective and antioxidant effect of polysaccharides (PS) extracted from Ulva lactuca against thiacloprid (THC) induced nephrotoxicity and hepatotoxicity. The antioxidant capacity of PS was tested in vitro using ABTS radical scavenging activity and plasmid DNA cleavage assays andin vivo on adult male rats treated for 30 days. Animals were allocated into four groups: control; THC (22.5 mg/kg); THC (22.5 mg/kg) + PS1 (100 mg/kg diet); and THC (22.5 mg/kg) + PS2 (200 mg/kg diet). The structural features of PS were determined by Fourier transformed infrared (FT‐IR), UV absorption peak detection, high performance liquid chromatography (HPLC) and gel permeation chromatography, and also functional properties were investigated. Overall, results indicated that THC increased significantly malondialdehyde, advanced oxidation protein products, glutathione levels, which is correlated with severe histological and plasmatic biochemical injuries in both liver and kidney tissues. However, cotreatment PS induced a significant protective and healing affects against the nephrotoxicity and hepatotoxcity induced by THC.
Surrogate models for parameterized representation of wake‐induced loads in wind farms
Authors: Dimitrov Nikolay 
Published: July 2019

AbstractA procedure for mapping wake‐induced load predictions computed with the dynamic wake meandering model to a computationally efficient surrogate model approximation is defined and demonstrated. Using the mapping function, the load variation can be efficiently estimated for a wind farm with arbitrary layout. The resulting load assessment procedure provides continuous, differentiable output with known analytical derivatives and can be used for applications such as wind turbine layout optimization, estimation of turbine lifetime, and uncertainty analysis.
European Union retail electricity markets in the Green Transition: The quest for adequate design
Authors: Boscán Luis R. 
Published: July 2019

AbstractAfter a gradual process of reforms, retail electricity markets in Europe are well established. In parallel, the decarbonization agenda and rapid technological progress lead the way toward a renewable‐based and distributed electricity system, in which new business models emerge. Distributed resources, prosumers, and peer‐to‐peer trading are all part of the most likely future scenarios. The newly adopted Clean Energy Package, put forward by the European Commission in 2016, responded to the consensus that existing electricity markets needed to adapt and aimed at putting consumers at the center. But will the ongoing reforms live up to the challenges posed by the coming stages of the ongoing Green Transition? While most recent analyses focus on wholesale issues, the present review narrows this gap. We analyze the European Union (EU) retail electricity market design in isolation, but also in its interaction with the renewable energy policy. We compare the current and the forthcoming legislative framework to elucidate if the recently adopted reforms mitigate conflicts or facilitate complementarities arising from the implementation of the European energy policy framework. While the reforms remove fundamental barriers for consumer participation, several unresolved conflicts remain. Thus, looking forward, there is a significant implementation challenge. Among these are the overdue task of making competition effective, striking the right balance between the verticality and horizontality of the future retail market and confronting market reconfiguration. In this respect, the paper makes several policy recommendations aimed at EU Member States, which are also valid for any jurisdiction willing to advance a transition to renewables.This article is categorized under:Energy and Climate > Economics and PolicyEnergy Systems Economics > Economics and PolicyEnergy Policy and Planning > Economics and Policy
Building a Large Robotic Thoracic Surgery Program in an Emerging Country: Experience in Brazil
Authors: Terra Ricardo Mingarini , Haddad Rui , de Campos José Ribas Milanese , de Araújo Pedro Henrique Xavier Nabuco , Lima Carlos Eduardo Teixeira , Braga Felipe , Bibas Benoit Jacques , Trindade Juliana Mol , Lauricella Leticia Leone , Pêgo‐Fernandes Paulo Manuel 
Published: July 2019

AbstractBackgroundIn the last decade, robotic video‐assisted thoracic surgery (R‐VATS) has grown significantly and consolidated as an alternative to video‐assisted thoracic surgery. The objective of this study is to present the implementation as well as the experience with R‐VATS accumulated by 2 Brazilian groups. We also compared the outcomes of procedures performed during the learning curve and after a more mature experience.MethodsRetrospective cohort study included all R‐VATS procedures performed since April 2015 until April 2018. We describe the process of implantation of robotic surgery, highlighting the peculiarities and difficulties found in a developing country. Moreover, we reported our descriptive results and compared the first 60 patients to the subsequent cases.ResultsTwo hundred and five patients included 101 females/104 males. Mean age was 61.7 years. There were hundred and sixty‐four pulmonary resections, 39 resections of mediastinal lesions, 1 diaphragmatic plication, and 1 resection of a hilar tumor. Median operative times were 205 min for lung resections and 129 min for mediastinal. There was no conversion to VATS or thoracotomy or major intraoperative complications. Median length of stay was 3 days for pulmonary resections and 1 day for mediastinal. Postoperative complications occurred in 35 cases (17.0%)—prolonged air leak was the most common (17 cases). One fatality occurred in an elderly patient with pneumonia and sepsis (0.4%). Comparison of the first 60 patients (learning curve) with subsequent 145 patients (consolidated experience) showed significant differences in surgical and ICU time, both favoring consolidated experience.ConclusionsOur results were comparable to the literature. Robotic thoracic surgery can be safely and successfully implemented in tertiary hospitals in emerging countries provided that all stakeholders are involved and compromised with the implementation process.
Perioperative Fluid Restriction in Abdominal Surgery: A Systematic Review and Meta‐analysis
Authors: Shen Yanfei , Cai Guolong , Gong Shijin , Yan Jing 
Published: July 2019

AbstractBackgroundPerioperative fluid management is a critical component in patients undergoing abdominal surgery. However, the benefit of restricted fluid regimen remains inconclusive. This systematic review aimed to explore potential factors causing these inconsistent findings.MethodsThe literature searches were performed in three databases including PubMed, Embase, and the Cochrane library until August 30, 2018. Only randomized, controlled trials comparing the effect of restricted versus liberal regimen in abdominal surgery were included. The primary outcome was total postoperative complications. Subgroup analysis was performed according to between‐group weight increase difference (≥ 2 kg and < 2 kg) and fluid intake ratio (≥ 1.8 and < 1.8).ResultsSixteen studies were finally included in this meta‐analysis. The benefit of the restricted regimen in reducing postoperative complication was only significant in the subgroup with high weight increase difference (≥ 2 kg) (RR 0.67, 95% CI 0.57–0.79) and the subgroup with high fluid intake ratio (≥ 1.8) (RR 0.72, 95% CI 0.62–0.82). In the subgroup with low weight increase difference (< 2 kg) or low fluid intake ratio (< 1.8), the effect of the restricted regimen was not significant (RR 0.88, 95% CI 0.51–1.50, and RR 1.18, 95% CI 0.91–1.53, respectively).ConclusionsThe benefit of the restricted regimen was only significant in the subgroup with high weight increase difference (≥ 2 kg) or high fluid intake ratio (≥ 1.8).
Home-based parent training for school-aged children with attention-deficit/hyperactivity disorder and behavior problems with remaining impairing disruptive behaviors after routine treatment: a randomized controlled trial
Authors: Nobel Ellen , Hoekstra Pieter J. , Agnes Brunnekreef J. , Messink-de Vries Dieneke E. H. , Fischer Barbara , Emmelkamp Paul M. G. , van den Hoofdakker Barbara J. 
Published: July 2019

AbstractThe objective is to investigate the effectiveness of home-based behavioral parent training for school-aged children with attention-deficit/hyperactivity disorder (ADHD) and behavior problems with remaining impairing disruptive behaviors after routinely offered treatments in clinical practice. In a randomized controlled study including 73 referred children with ADHD and impairing disruptive symptoms after routine clinical pharmacotherapy and/or clinic-based parent training had been tried or, at least, offered, home-based behavioral parent training (n = 26) was compared to a waiting list (n = 23) and a care-as-usual home-based treatment (n = 24). It was unknown to families which of the home-based treatments that they received. Using mixed models for repeated measures, we examined the effectiveness on the primary outcome measure of children’s severity of disruptive behaviors and on a number of secondary outcome measures [the degree to which parents experienced the disruptive behaviors as troublesome, ADHD symptoms, oppositional-defiant disorder (ODD) symptoms, and internalizing problems]. Compared to the waiting list, children receiving home-based parent training improved significantly more regarding severity of disruptive behaviors (ES = 0.75), ADHD symptoms (ES = 0.89), ODD symptoms (ES = 0.65), and internalizing problems (ES = 0.60). Compared to care-as-usual, home-based parent training was more effective in reducing disruptive behaviors (ES = 0.57), ADHD symptoms (ES = 0.89), and ODD symptoms (ES = 0.88). Significantly more reduction of children’s internalizing problems was not found. In conclusion, children with ADHD and residual behavioral problems after routine treatment may benefit from home-based behavioral parent training.
Impact of polymer addition, electrolyte, clay and antioxidant on rheological properties of polymer fluid at high temperature and high pressure
Authors: Zheng Wenlong , Wu Xiaoming , Huang Yuming 
Published: July 2019

AbstractNowadays, the application of polymer in petroleum industries due to its feasibility with enhancing hole cleaning, less formation damage characteristics of drilling fluids has been particularly advantageous in deep well operation. However, figuring out the influence mechanism of temperature on the rheological behavior of polymer fluids and keeping the excellent rheological regulation at high temperature and high pressure (HTHP) are still serious issues for the mud designers. In this work, the rheological properties of a commonly used drilling fluid polymer treating agent named Driscal-D were tested under HTHP conditions by Fann 50SL rheometer. The effects of polymer addition, electrolyte, clay type and antioxidant on the rheological properties of Driscal-D solution were studied in high-temperature environments. Results showed that the viscosity of the solutions tends to increase with the polymer addition increases, making its pseudoplastic characteristics more noticeable. As the temperature rises, the fluid loses viscosity, causing the polymer solution to evolve from pseudoplastic fluid to Newtonian fluid. The presence of the electrolyte and the oxygen scavenger leads to a decrease in the viscosity of the solution, but in high-temperature environments, the solution adding formate or antioxidant has a higher viscosity retention rate than the pure solution at low shear rates (< 50 s−1). The incorporation of the clay in Driscal-D solution enhances the rheological properties, which is beneficial for cuttings transportation. And the dispersion is best described by Herschel–Bulkley model.
New perspectives on the Erlang-A queue
Authors: Daw Andrew , Pender Jamol 
Published: July 2019

AbstractThe nonstationary Erlang-A queue is a fundamental queueing model that is used to describe the dynamic behavior of large-scale multiserver service systems that may experience customer abandonments, such as call centers, hospitals, and urban mobility systems. In this paper we develop novel approximations to all of its transient and steady state moments, the moment generating function, and the cumulant generating function. We also provide precise bounds for the difference of our approximations and the true model. More importantly, we show that our approximations have explicit stochastic representations as shifted Poisson random variables. Moreover, we are also able to show that our approximations and bounds also hold for nonstationary Erlang-B and Erlang-C queueing models under certain stability conditions.