bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fast and stable composite learning via high‐order optimization
Authors: Jiang Tao , Han Hongwei 
Published: September 2020

SummaryFast and stable adaptation is necessary to achieve stringent tracking performance specifications in the face of large system uncertainties. This work develops a novel fast adaption architecture based on a high‐order optimization idea, where an approximated filter of weight is applied to smoothen and stabilize the estimation process. Larger learning rate can be selected to achieve fast adaption in that high‐frequency uncertainties are attenuated. Moreover, composite learning combined with filtering regression and experience replay technique is utilized to further smoothen and accelerate the parameter estimation process. Given a nonlinear plant with multi‐input multi‐output strict‐feedback structure, the proposed adaptive control is integrated into the backstepping framework. The uniformly bounded property of the tracking errors and the approximation errors is proven by Lyapunov theory. The superiority of the proposed method is demonstrated by comparative simulations.
Quantifying the habitat preferences of the stoneflyPteronarcys californicain Colorado
Authors: Kowalski Dan A. , Richer Eric E. 
Published: September 2020

AbstractThe salmonfly (Pteronarcys californica) is a large stonefly species that is ecologically important and recreationally significant to anglers in coldwater river systems throughout the western United States. Salmonflies are sensitive to disturbance and pollution and are considered an indicator of quality coldwater stream habitat. They are declining in range and abundance in some river systems and their extirpation from several western rivers has led to restoration attempts including habitat improvement projects and direct reintroductions. These efforts could be improved with a clear understanding of the causes of these declines, a quantitative description of the species' preferred habitat, and practical management recommendations for the restoration of habitat where it has been lost. The objective of this study was to measure variables that describe the physical habitat of sites supporting varying densities of salmonflies in Colorado. Width to depth ratio, bed slope, D50 sediment size, percent fine sediment, and embeddedness were measured at 18 riffle sites and compared to an index of salmonfly density estimated over 3 years. Correlation analysis and multiple linear regression with model selection were used to identify important variables. Salmonfly density was highest at sites with low amounts of fine sediment, low cobble embeddedness, and large cobble size. Fine sediment (particles < 2 mm) was the single best predictor of salmonfly density and ranged from 0–6% at sites with high salmonfly densities. As habitat characteristics influence the range and density of salmonflies in Colorado and elsewhere, results from this study can inform land use practices, flow management, and river restoration activities to benefit this important indicator species.
Conversion of Biomass Wastes into Activated Carbons by Chemical Activation for Hydrogen Storage
Authors: Peng Zifang , Xu Ying , Luo Weimin , Wang Chenguang , Ma Longlong 
Published: September 2020

AbstractThe investigation of activated carbons for hydrogen storage has attracted great attention due to their easy availability, adjustable microstructure and large specific surface area. Herein, three kinds of agricultural biomass wastes (bagasse, cornstalk and pine powder) are used to prepare activated carbons via chemical activation (H3PO4, ZnCl2 and KOH). The interinfluence of precursors and activators on the activated carbon was investigated. We found that the same biomass treated with different activators possessing totally unique characters, whereas three kinds of biomass activated with the same activators exhibited mild difference. Specifically, KOH contributed the largest specific surface area. The optimized activated carbons were used for hydrogen storage measurement and exhibited high storage capacity. Hydrogen storage capacity of activated carbon is proportional to volume of micropores. Conversion of cheap biomass wastes into activated carbon for hydrogen storage is significant for rational utilization of resources and energy storage.
Tautomeric Study of Schiff Bases Derived from o‐Dihydroxybenzaldehyde by UV‐Vis, IR, 1H NMR, 13C NMR Spectroscopy and Computational Modeling.
Authors: Atzin‐Macedo Carmen María , Pastor‐Ramírez Cándida , González‐Peláez Rafael , Pérez‐Flores Francisco Javier , Hernández‐Anzaldo Samuel , Vazquez‐Lima Hugo , Reyes‐Ortega Yasmi 
Published: September 2020

AbstractTautomeric equilibria at room temperature were studied for three aromatic imine polyol compounds, previously reported 2‐((2‐hydroxybenzylidene)amino)‐2‐(hydroxymethyl)propane‐1,3‐diol 1 and two new compounds 2‐(((1,3‐dihydroxy‐2‐(hydroxymethyl)propan‐2‐yl)imino)methyl)benzene‐1,4‐diol 2 and 3‐(((1,3‐dihydroxy‐2‐(hydroxymethyl)propan‐2 yl)imino)methyl)benzene‐1,2‐diol 3. The dynamic behavior of these equilibria is described by a combination of IR, UV‐Vis and NMR spectroscopic measurements with DFT and TDDFT calculations in condensed phase. Among the different approaches, the combination of UV‐Vis experimental spectra with the oscillator strengths values estimated from TDDFT calculations allowed for the assessment of the tautomeric populations in DMSO and methanol. These results were consistent with different functionals employed GGA, Hybrid and MetaGGA.
Z‐scheme 3 D g‐C3N4/TiO2−x Heterojunctions with High Photocatalytic Efficiency
Authors: Li Zhenxing , Ge Kai , Yang Kai , Wang Shuang , Li Xuehan , He Jiahui , Fu Congcong , Ye Jin , Zhang Yue , Yang Yongfang 
Published: September 2020

AbstractThe 3D network structure composed of g‐C3N4 nanorods was prepared via treatment of bulk g‐C3N4 with hot HNO3 followed by adjustment the pH and lyophilization. Then the 3D g‐C3N4/TiO2−x heterojunctions with a strong interface was constructed via loading TiO2−x nanoparticles onto the 3D g‐C3N4 networks under hydrothermal conditions. The structure and morphology of the 3D g‐C3N4/TiO2−x heterojunctions was characterized by infrared spectrum (FTIR), X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and field emission transmission electron microscope (TEM). The photo‐degradation rate of Doxycycline HCl for 3D g‐C3N4/TiO2−x heterojunction is about 4 times of that original bulk‐C3N4 and 2.75 times of 3D g‐C3N4. The improved photocatalytic efficiency is attributed to 3D g‐C3N4 networks, which provides the more transfer channel to accelerate the electron transportation and the strong heterointerface between g‐C3N4 and TiO2−x which promotes the separation of the electron‐holes. Besides, more adsorption capacity of the pollutant onto the 3D g‐C3N4/TiO2−x also contributed to this high efficiency.
Interface Engineering of Partially Phosphidated Co@Co–P@NPCNTs for Highly Enhanced Electrochemical Overall Water Splitting
Authors: Jiao Jiqing , Yang Wenjuan , Pan Yuan , Zhang Chao , Liu Shoujie , Chen Chen , Wang Dingsheng 
Published: September 2020

AbstractInterface engineering is promising but still challenging for developing highly efficient and stable non‐noble‐metal‐based electrocatalysts for water splitting. Herein, partially phosphidated core@shell Co@Co–P nanoparticles encapsulated in bamboo‐like N, P co‐doped carbon nanotubes (denoted as Part‐Ph Co@Co–P@NPCNTs) are prepared through a pyrolysis–oxidation–phosphidation strategy. In this structure, each Co nanoparticle is covered with a thin Co–P layer to form a special core@shell heterojunction interface, and the core@shell structure is further encapsulated by N, P co‐doped CNTs that not only protect the Co from corrosion but also guarantee an effective and fast electron transfer on cobalt phosphide. As a bifunctional catalyst for both the hydrogen evolution reaction and oxygen evolution reaction, it exhibits an excellent activity for overall water splitting, and enables long‐term operation without significant degradation. Density functional theory calculations demonstrate that the interface of the Co/Co2P heterojunction could lower the values of ΔGH* (hydrogen adsorption) and ΔGB (water dissociation), which are negatively correlated to the j10, because of the electronic structures of up‐shifted d‐band center. This study not only presents an efficient and stable electrocatalyst for overall water splitting but also provides a special route for the interface engineering of heterostructures.
SeC Bonding Promoting Fast and Durable Na+ Storage in Yolk–Shell SnSe2@SeC
Authors: Xiao Shuhao , Li Zhenzhe , Liu Jintao , Song Yushan , Li Tingshuai , Xiang Yong , Chen Jun Song , Yan Qingyu 
Published: September 2020

AbstractTin‐based compounds have received much attention as anode materials for lithium/sodium ion batteries owing to their high theoretical capacity. However, the huge volume change usually leads to the pulverization of electrode, giving rise to a poor cycle performance, which have severely hampered their practical application. Herein, highly durable yolk–shell SnSe2 nanospheres (SnSe2@SeC) are prepared by a multistep templating method, with an in situ gas‐phase selenization of the SnO2@C hollow nanospheres. During this process, Se can be doped into the carbon shell with a tunable amount and form SeC bonds. Density functional theory calculation results reveal that the SeC bonding can enhance the charge transfer properties as well as the binding interaction between the SnSe2 core and the carbon shell, favoring an improved rate performance and a superior cyclability. As expected, the sample delivers reversible capacities of 441 and 406 mAh g−1 after 2000 cycles at 2 and 5 A g−1, respectively, as the anode material for a sodium‐ion battery. Such performances are significantly better than the control sample without the SeC bonding and also other metal selenide‐based anodes, evidently showing the advantage of Se doping in the carbon shell.
Highly Ordered Nanochannels in a Nanosheet‐Directed Thin Zeolite Nanofilm for Precise and Fast CO2 Separation
Authors: Wang Bin , Wu Tangyin , Yu Miao , Li Shiguang , Zhou Rongfei , Xing Weihong 
Published: September 2020

AbstractPrecise molecular and ion separations depend largely on the size and uniformity of the nanochannels in a defect‐free microporous nanofilm. Ordered and perpendicular nanochannels with uniform pore size are assembled into a continuous and defect‐free film by a “gel nuclei‐less” route. The ultrathin (<50 nm) zeolite nanosheets seeding layer induces the formation of defect‐free zeolite nanofilms (500–800 nm) with preferential [100] orientation well‐aligned to the transport pathway. The large‐area and thin silicoaluminophosphate‐34 (SAPO‐34) nanofilm consisting of uniform and straight nanochannels shows a milestone CO2 permeance of ≈1.0 × 10−5 mol (m2 s Pa)−1 and high CO2/CH4 and CO2/N2 selectivities of 135 and 41 in equimolar binary mixtures at room temperature and 0.2 MPa feed pressure, respectively. These results suggest that highly oriented and thin SAPO‐34 nanofilms prepared from nanosheets might have great potential for CO2 capture from natural gas, biogas, and flue gas.
Electrochemical Insights, Developing Strategies, and Perspectives toward Advanced Potassium–Sulfur Batteries
Authors: Yuan Xiaomin , Zhu Bo , Feng Jinkui , Wang Chengguo , Cai Xun , Qiao Kun , Qin Rongman 
Published: September 2020

AbstractThe boosting demand for high‐capacity energy storage systems requires innovative battery technologies with low‐cost and sustainability. The advancement of potassium–sulfur (K–S) batteries have been triggered recently due to abundant resource and cost effectiveness. However, the functional performance of K–S batteries is fundamentally restricted by the vague understanding of K–S electrochemistry and the imperfect cell components or architectures, facing the issues of low cathode conductivity, intermediate shuttle loss, poor anode stability, electrode volume fluctuation, etc. Inspired by considerable research efforts on rechargeable metal–sulfur batteries, the holistic K–S system can be stabilized and promoted through various strategies on rational physical regulation and chemical engineering. In this review, first an attempt is made to address the electrochemical kinetic concept of K–S system on the basis of the emerging studies. Then, the classification of performance‐improving strategies is thoroughly discussed in terms of specific battery component and prospective outlooks in materials optimization, structure innovations, as well as relevant electrochemistry are provided. Finally, the critical perspectives and challenges are discussed to demonstrate the forward‐looking developmental directions of K–S batteries. This review not only endeavors to provide a deep understanding of the electrochemistry mechanism and rational designs for high‐energy K–S batteries, but also encourages more efforts in their large‐scale practical realization.
Modulation of Disordered Coordination Degree Based on Surface Defective Metal–Organic Framework Derivatives toward Boosting Oxygen Evolution Electrocatalysis
Authors: Zheng Xinyue , Jia Gan , Fan Guozheng , Luo Wenjun , Li Zhaosheng , Zou Zhigang 
Published: September 2020

AbstractSeeking potential electrocatalysts with both large‐scale application and robust activity for the oxygen evolution reaction allows for no delay. Herein, a squarate‐based metal–organic framework (MOF) ([Co3(C4O4)2(OH)2]⋅3H2O) is reported for electrocatalytic water oxidation. A facile, green, and low‐cost strategy is proposed to introduce defects by not only rationally breaking CoO bonds to form defective coordination environment and electronic reconfiguration, but also systematically modulates defect concentration to optimize electrochemical performance. As a result, the post‐treated surface defective MOF derivative (Co‐MOF‐3h) achieves a current density of 50 mA cm−2 at an overpotential of 380 mV, owing to larger active surface area, more opened active sites, and favorable conducting channels. Finally, density functional theory calculations have further validated the effect of defective coordination in regard to electronic structure for electrocatalysts. This study delivers inspirations in defect engineering and is in favor of developing high‐efficiency electrocatalysts.
Evaluation of Agile Team Work Quality
Authors: Poth Alexander , Kottke Mario , Riel Andreas 
Published: September 2020

Abstract
The maturity of organizations is measured with process assessment models like the ISO/IEC 33001. The product quality is aligned with internal and external product quality charactersitics based on models like the ISO/IEC 25010. With the shift from the Tailorism-driven process orientation to a more people centric organization, the two dimensions process and product quality have to be extened by the people or team quality dimension. The presented approach offers aspects for agile Team Work Quality (aTWQ), as well as related measurement indicators. The approach is evaluated in the large enterprise context of the Volkswagen AG. The indicators of aTWQ have been integrated and established in the agile tool box for a sustainable agile transition of the company.
On the Use of Web Assembly in a Serverless Context
Authors: Murphy Seán , Persaud Leonardas , Martini William , Bosshard Bill 
Published: September 2020

Abstract
This paper considers how WASM can be run in different serverless contexts. A comparison of different serverside WASM runtime options is considered, specifically focused on , and . Next, different options for running WASM within two serverless platforms – Openwhisk and AWS Lambdai – are compared. Initial results show that a solution which uses the built-in WASM supports is found to work better than using the dedicated WASM runtimes but this has limitations and providing more direct integration with WASM runtimes should be explored further.
It’s Not Easy Being Agile: Unpacking Paradoxes in Agile Environments
Authors: Horlach Bettina , Drechsler Andreas 
Published: September 2020

AbstractIn this paper, we outline inherent tensions in Agile environments, which lead to paradoxes that Agile teams and organizations have to navigate. By taking a critical perspective on Agile frameworks and Agile organizational settings the authors are familiar with, we contribute an initial problematization of paradoxes for the Agile context. For instance, Agile teams face the continuous paradox of ‘doing Agile’ (= following an established Agile way of working) versus ‘being Agile’ (= changing an established Agile way of working). One of the paradoxes that organizations face is whether to start their Agile journey with a directed top-down (and therefore quite un-Agile) ‘big bang’ or to allow an emergent bottom-up transformation (which may be more in-line with the Agile spirit but perhaps not be able to overcome organizational inertia). Future research can draw on our initial problematization as a foundation for subsequent in-depth investigations of these Agile paradoxes. Agile teams and organizations can draw on our initial problematization of Agile paradoxes to inform their learning and change processes.
Improving Agility by Managing Shared Libraries in Microservices
Authors: de Toledo Saulo S. , Martini Antonio , Sjøberg Dag I. K. 
Published: September 2020

Abstract
Using microservices is a way of supporting an agile architecture. However, if the microservices development is not properly managed, the teams’ development velocity may be affected, reducing agility and increasing architectural technical debt. This paper investigates how to manage the use of shared libraries in microservices to improve agility during development. We interviewed practitioners from four large international companies involved in microservices projects to identify problems when using shared libraries. Our results show that the participating companies had issues with shared libraries as follows: coupling among teams, delays on fixes due to overhead on libraries development teams, and need to maintain many versions of the libraries. Our results highlight that the use of shared libraries may hinder agility on microservices. Thus, their use should be restricted to situations where shared libraries cannot be replaced by a microservice and the costs of replicating the code on each service is very high.
Spotify Tailoring for Architectural Governance
Authors: Salameh Abdallah , Bass Julian M. 
Published: September 2020

AbstractOrganisations usually tailor Agile methods to fit their needs best. Spotify has developed its own Agile culture to facilitate software development for hundreds of developers across multiple cities. The Spotify model has become influential among agile proponents and hence formed the basis of methods used in other organisations. We have identified a lack of research into agile architecture using the Spotify model.To exploreHow can architectural governance increase the autonomy of teams when using the Spotify model?, an intervention embedded case study was conducted in a multinational FinTech organisation, using the Spotify model. New processes were introduced by developing and evaluating an approach to Agile architectural governance. This approach incorporates a structural change and a change management process. We conducted 6 semi-structured open-ended interviews and direct observations of Agile practices. The collected data was analysed using Thematic Analysis and informed by some Grounded Theory techniques.The practitioners in our study report benefits of this evaluated approach. These benefits include transforming architectural based decision into decentralised based decision-making, strengthening the autonomy of squads through aligning architectural based decisions, sharing the architectural knowledge among the squads, and other benefits.We identify the characteristics and benefits of our evaluated approach to Agile architectural governance using the Spotify model. Also, we identify guidelines and challenges for those wishing to adopt this approach.
Defining TestOps: Collaborative Behaviors and Technology-Driven Workflows Seen as Enablers of Effective Software Testing in DevOps
Authors: Doležel Michal 
Published: September 2020

Abstract
Context: DevOps is an increasingly popular approach to software development and software operations. Being understood as mutually integrated, both activities have been re-united under one single label. In contrast to traditional software development activities, DevOps promotes numerous fundamental changes, and the area of software testing is not an exception. Yet, the exact appearance of software testing within DevOps is poorly understood, so is the notion of TestOps. Objective: This paper explores TestOps as a concept rooted in industrial practice. Method: To provide a pluralist outline of practitioners’ views on What is TestOps, the YouTube platform was searched for digital content containing either “TestOps” or “DevTestOps” in the content title. Through a qualitative lens, the resulting set was systematically annotated and thematically analyzed in an inductive manner. Results: Referring to DevOps, practitioners use the notion of TestOps when characterizing a conceptual shift that occurs within the area of software testing. As a matter of fact, two dominant categories were found in the data: (i) TestOps as a new organizational philosophy; (ii) TestOps as an innovative software technique (i.e. process supported by technology). A set of high-level themes within each of these categories was identified and described. Conclusion: The study outlines an inconsistency in practitioner perspectives on the nature of TestOps. To decrease the identified conceptual ambiguity, the proposed model posits two complementary meanings of TestOps.
Investigating Agile Adoption in Saudi Arabian Mobile Application Development
Authors: Altuwaijri Fahad S. , Ferrario Maria Angela 
Published: September 2020

Abstract
Mobile app development has been considered as one of the fastest growing segments of the software industry both worldwide and in Saudi Arabia. Due to their pervasiveness, mobile applications call for consideration of complex and rapidly changing requirements given the diversity of their environments. Therefore, agile is considered the most suitable methodology for developing mobile apps. However, little research has investigated agile adoption in mobile app development in the real context. Therefore, the purpose of this PhD is to investigate the factors that have a significant impact on agile adoption in mobile app development by small and medium-size software organisations in Saudi Arabia. The expected key contribution of this research will be a deep insight into agile adoption in mobile app development, and the design and development of tools and techniques that may support agile adoption within Saudi context.
What Key Aspects Do ICOs Reveal About Their Businesses?
Authors: Laatikainen Gabriella , Semenov Alexander , Zhang Yixin , Abrahamsson Pekka 
Published: September 2020

AbstractBlockchain technologies disrupt industries by enabling decentralized and transactional data sharing across a network of untrusted participants, among others. Initial Coin Offerings (ICOs) are a novel form of crowdfunding through which hundreds of blockchain-enabled businesses manage to raise billions of dollars in total only in United States. However, there is a lack of understanding of the ICO phenomenon especially related to the business aspects. In this paper, we describe the results of an exploratory study of 91 ICOs and identify the key business model elements that ICOs reveal in their websites and whitepapers. Furthermore, we also note the immaturity and lack of transparency of the business aspects of businesses behind the ICO campaigns.