bluuebunny/crossref_metadata_2025_split huggingface dataset:
Topological Phase Transition and Phase Diagrams in a Two‐Leg Kitaev Ladder System
Authors: Yan Yu , Qi Lu , Wang Dong‐Yang , Xing Yan , Wang Hong‐Fu , Zhang Shou 
Published: February 2020

AbstractA scheme to investigate the topological properties in a two‐leg Kitaev ladder system composed of two Kitaev chains is proposed. In the case of two identical Kitaev chains, it is found that the interchain hopping amplitude plays a significant role in the separation of the energy spectrum and in inducing a topologically nontrivial phase, while the interchain pairing strength only affects the size of the energy gap. Moreover, another situation that the system consists of two non‐identical Kitaev chains is also investigated and the corresponding phase diagram is calculated. It is found that two pairs of degenerate nonzero edge modes will, respectively, appear in the upper and lower energy gaps when the interchain hopping amplitude or the interchain pairing strength is large enough. Furthermore, it is pointed out that the winding number is quantitatively equivalent to half of the number of zero energy edge modes in our system.
π‐Interactions between Cyclic Carbocations and Aromatics Cause Zeolite Deactivation in Methanol‐to‐Hydrocarbon Conversion
Authors: Wang Chao , Hu Min , Chu Yueying , Zhou Xue , Wang Qiang , Qi Guodong , Li Shenhui , Xu Jun , Deng Feng 
Published: February 2020

AbstractThe understanding of catalyst deactivation represents one of the major challenges for the methanol‐to‐hydrocarbon (MTH) reaction over acidic zeolites. Here we report the critical role of intermolecular π‐interactions in catalyst deactivation in the MTH reaction on zeolites H‐SSZ‐13 and H‐ZSM‐5. π‐interaction‐induced spatial proximities between cyclopentenyl cations and aromatics in the confined channels and/or cages of zeolites are revealed by two‐dimensional solid‐state NMR spectroscopy. The formation of naphtalene as a precursor to coke species is favored due to the reaction of aromatics with the nearby cyclopentenyl cations and correlates with both acid density and zeolite topology.
Orthogonal Cationic and Radical RAFT Polymerizations to Prepare Bottlebrush Polymers
Authors: Tanaka Joji , Häkkinen Satu , Boeck Parker T. , Cong Yidan , Perrier Sébastien , Sheiko Sergei S. , You Wei 
Published: February 2020

AbstractAn orthogonal combination of cationic and radical RAFT polymerizations is used to synthesize bottlebrush polymers using two distinct RAFT agents. Selective consumption of the first RAFT agent is used to control the cationic RAFT polymerization of a vinyl ether monomer bearing a secondary dormant RAFT agent, which subsequently allows side‐chain polymers to be grafted from the pendant RAFT agent by a radical‐mediated RAFT polymerization of a different monomer, thus completing the synthesis of bottlebrush polymers. The high efficiency and selectivity of the cationic and radical RAFT polymerizations allow both polymerizations to be conducted in one‐pot tandem without intermediate purification.
Construction of Various Bridged Polycyclic Skeletons by Palladium‐Catalyzed Dearomatization
Authors: Mu Xingye , Yu Hanxiao , Peng Henian , Xiong Wenrui , Wu Ting , Tang Wenjun 
Published: February 2020

AbstractA powerful palladium‐catalyzed dearomative cyclization was developed that provides facile access to eight types of bridged tetracyclic skeletons bearing various ring sizes and heterocycles. With this method, several skeletons or analogues of natural products, including tubingensin B and dracaenones, were synthesized. Asymmetric dearomative cyclization enables the construction of various enantiomerically enriched bridged polycyclic systems with up to 99 %eeby employing a chiral palladium catalyst.
Deep insight into interaction mechanisms between ESBR and silica modified by different silane coupling agents
Authors: Wang Chen , Li Ai , Kong Miqiu , Yang Qi , Lv Yadong , Huang Yajiang , Li Guangxian 
Published: February 2020

AbstractIn this study, the interaction mechanisms of different silane coupling agents on the mechanical properties, dynamic viscoelastic properties, and rheological properties of emulsion styrene‐butadiene rubber (ESBR)/silica composites were investigated. It is found that the comprehensive performances are improved by the addition of silane coupling agents and the optimal performance is exhibited in ESBR filled with 50 phr modified silica. Moreover, with the addition of the bis‐(3‐triethoxysilylpropyl)‐tetrasulfide modified silica, the wet skid resistance of composites is significantly enhanced by 14.0%, whereas by the addition of 3‐octanoylthio‐1‐propyltriethoxysilane modified silica, the rolling resistance is remarkably reduced by 19.6% and the processing safety is improved. It can be attributed to the increased bound rubber contents induced by the enhanced interactions between the modified silica and rubber matrix characterized by rheological properties. Furthermore, it is pointed out that the second layer bound rubber plays a dominant role in the improved properties of the composites.
Optical biosensor for catechol determination based on laccase‐immobilized anionic polyamide 6 microparticles
Authors: Cano‐Raya Clara , Dencheva Nadya V. , Braz Joana F. , Malfois Marc , Denchev Zlatan Z. 
Published: February 2020

AbstractThis work presents the preparation, optimization, and testing of an enzyme‐based optical biosensor for catechol determination. The sensing area is attached to a glass support and contains: anionic polyamide 6 (PA6) porous microparticles supporting laccase from Trametes Versicolor, embedded in a Pebax® MH1657 polymer binder that contains the optical indicator dye 3‐methyl‐2‐benzothiazolinone hydrazone (MBTH), responsible for the optical transduction. The catechol analyte, after its enzymatic oxidation, forms o‐benzoquinone that can be detected by oxidative coupling with MBTH giving rise to a colored product. The latter can be quantified measuring the UV/VIS absorbance at 500 nm. The PA6 microparticles performed as useful laccase carriers reaching high immobilization yields of up to 99.8% and preserving the enzyme catalytic activity. This permitted the preparation of a new biosensor presenting a detection limit of 11 μM and responding linearly to up to 118 μM of catechol. Biosensor applicability was tested in spiked natural water samples from river and spring. The recovery rates observed were in the range of 97–108% that proves the good accuracy of the proposed biosensor.
Mechanical, thermal, and structural properties of uniaxially drawn polylactic acid/halloysite nanocomposites
Authors: Bagheri Ehsan , Mosaddegh Peiman , Behzad Tayebeh 
Published: February 2020

AbstractThe effect of solid‐state drawing at different conditions including drawing ratio (DR), drawing temperature (DT), and drawing speed (DS) on mechanical, thermal, and structural properties of polylactic acid (PLA)/halloysite nanotubes (HNTs) composites were studied. PLA/HNTs composite films were prepared by melt mixing process followed by compression molding. Subsequently, drawing was performed using a tensile testing machine. Field emission scanning electron microscopy confirmed alignment and orientation of polymer chains and HNTs after stretching. Thermal and mechanical analysis of the drawn films revealed that glass transition temperature, crystallinity, ultimate tensile strength, and Young's modulus were enhanced by increasing DR, DT, and DS. However, toughness was decreased by increasing DR and DS and increased by increasing DT. In addition, the drawn nanocomposites showed superior mechanical and thermal properties compared to the drawn neat PLA films indicating the high efficiency of solid‐state drawing and positive effect of HNTs. Therefore, this study could be helpful to introduce an approach to enhance the properties of biopolymers and renewable polymers by uniaxial drawing.
Inexpensive throughfall exclusion experiment for single large trees
Authors: Cranston Benjamin M. , Powers Breanna F. , Macinnis‐Ng Cate 
Published: February 2020

PremiseDrought‐induced tree mortality is an emergent threat to forests worldwide, particularly to large trees. Drought‐manipulation experiments involving throughfall exclusion (TFE) tend to focus on large plots that can be expensive to establish and maintain and may be unsuitable for large trees or indigenous forests. We set out to establish a relatively inexpensive TFE method in a natural forest with large trees.MethodsWe designed a novel TFE method and installed it in the Waitākere Range of West Auckland, New Zealand, to study the southern conifer kauri (Agathis australis) under long‐term simulated drought. We measured fluxes of water (sap flow) and carbon (stem increment and litterfall) as indicators of drought effects.ResultsThroughfall was cut off to a 22.25‐m2 area around individual boles, causing reduced soil moisture and reduced sap flow in droughted trees.DiscussionOur new TFE method centered on individual, large trees in native forest and is highly customizable to fit other forest and species types. It can be used to assess physiological responses to drought of individual trees independent of stem size.
Application work using software tools and didactic equipment of electrical machines in electrical engineering studies
Authors: Torrent Marcel , Martinez Eusebi , Perat José I. 
Published: February 2020

AbstractThis article describes the use of software tools and didactic equipment of electrical machines applied to the teaching in electrical engineering, specifically in the realization of an application work consisting of the characterization of the three‐phase induction motor. Several studies have explored the effectiveness of teaching activities, which encompass different learning tools in the same work, from the use of didactic materials to the use of professional computer tools. The objective is the simultaneous use of didactic equipment and the calculation methodologies through specific software of industrial applications in engineering studies. In addition, to observe whether performing application work that implementing different techniques at the same time fosters the critical spirit among students. The activities students must do in the application work proposed in the subject of rotating electrical machines is to determine all the constructive variables of an induction motor, draw it, simulate its electromagnetic behavior by finite element method with a freeware available 2D program, test the motor in the laboratory following the guidelines of the current standards and, finally, compare the results obtained from the tests and the simulation, by making a critique of the results and the calculation methodology used. The application work presented in the article has been implemented during several courses in the subject of electrical machines for electrical engineering students, with satisfactory results.
An investigation of the droplet size distributions in a cyclone reactor for liquid‐liquid heterogeneous reactions using FBRM and PVM
Authors: Zhang Mingyang , Li Xiaoyu , Zhang Linhua , Wang Zhenbo , Xiao Xue , Zhu Liyun 
Published: February 2020

AbstractA multi‐element process coupled cyclone reactor for the liquid‐liquid heterogeneous reaction was proposed. This paper presents the investigation of dispersed phase droplet size distributions near the wall surface using FBRM and PVM. To translate a chord length distribution (CLD) measured by the FBRM instrument into its droplet size distribution (DSD), a CLD‐DSD transformation model was proposed. Moreover, the effects of operational parameters on the droplet size distributions were studied. The results show that the total inlet flow plays a decisive role on the dispersed phase droplet size distributions, while the influence of feed ratio is mainly reflected in inhibiting the probability of droplet coalescence. In comparison, the influence of overflow ratio on the droplet size distributions can be neglected.
Axially Chiral Cannabinols: A New Platform for Cannabinoid‐Inspired Drug Discovery
Authors: Navaratne Primali V. , Wilkerson Jenny L. , Ranasinghe Kavindri D. , Semenova Evgeniya , Felix Jasmine S. , Ghiviriga Ion , Roitberg Adrian , McMahon Lance R. , Grenning Alexander J. 
Published: February 2020

AbstractPhytocannabinoids (and synthetic analogs thereof) are gaining significant attention as promising leads in modern medicine. Considering this, new directions for the design of phytocannabinoid‐inspired molecules is of immediate interest. In this regard, we have hypothesized that axially‐chiral‐cannabinols (ax‐CBNs), unnatural and unknown isomers of cannabinol (CBN) may be valuable scaffolds for cannabinoid‐inspired drug discovery. There are two main factors directing our interest to these scaffolds: (a) ax‐CBNs would have ground‐state three‐dimensionality; ligand‐receptor interactions can be more significant with complimentary 3D‐topology, and (b) ax‐CBNs at their core structure are biaryl molecules, generally attractive platforms for pharmaceutical development due to their ease of functionalization and stability. Herein we report a synthesis of ax‐CBNs, examine physical properties experimentally and computationally, and perform a comparative analysis of ax‐CBN and THC in mice behavioral studies.
Characterization of Drosophila octopamine receptor neuronal expression using MiMIC‐converted Gal4 lines
Authors: McKinney Hannah M. , Sherer Lewis M. , Williams Jessica L. , Certel Sarah J. , Stowers R. Steven 
Published: February 2020

AbstractOctopamine, the invertebrate analog of norepinephrine, is known to modulate a large variety of behaviors in Drosophila including feeding initiation, locomotion, aggression, and courtship, among many others. Significantly less is known about the identity of the neurons that receive octopamine input and how they mediate octopamine‐regulated behaviors. Here, we characterize adult neuronal expression of MiMIC‐converted Trojan‐Gal4 lines for each of the five Drosophila octopamine receptors. Broad neuronal expression was observed for all five octopamine receptors, yet distinct differences among them were also apparent. Use of immunostaining for the octopamine neurotransmitter synthesis enzyme Tdc2, along with a novel genome‐edited conditional Tdc2‐LexA driver, revealed all five octopamine receptors express in Tdc2/octopamine neurons to varying degrees. This suggests autoreception may be an important circuit mechanism by which octopamine modulates behavior.
Study on the preference of city color image selection based on the logistic model: A case study of Shanghai
Authors: Wang Jiangbo , Zhang Lingyun , Gou Aiping 
Published: February 2020

AbstractWith the continuous progress of urbanization, China's urban color planning has begun to receive attention, but there are still many problems in the quality of color environment. In order to clarify further the urban color positioning of our country, the detailed urban color planning objectives are set up, and the opinions of residents with different attributes are included in the consideration scope of urban color planning objectives, so as to guide the future urban color planning scientifically. From the perspective of urban residents' preference, this article takes Shanghai as an example to analyze the difference of residents' preference for urban color selection with different attributes. In this article, the logistic regression model was used to analyze the results of residents' choice, so as to conclude that the significant factors influencing residents' preference for city color image include age, monthly income, current city of residence, frequency of coming to Shanghai and whether they have been to other countries. Therefore, paying attention to the above significant attributes of residents and carrying out in‐depth research can provide reference value for the status of the city's future color image.
Chief executive officer narcissism and firm value: The mediating role of corporate social responsibility in the South Korean context
Authors: Yook Keun‐Hyo , Lee Su‐Yol 
Published: February 2020

AbstractThis study analyzes whether narcissism in chief executive officers (CEOs) affects firm value through the promotion of corporate social responsibility (CSR) initiatives. Employing the upper‐echelons perspective, we present a research framework for the relationship between CEO narcissism and firm performance with CSR as the mediation variable. The results of the regression analysis of 265 firm‐year South Korean samples from 2010 to 2016 indicate that CEO narcissism promotes CSR initiatives and CSR enhances firm value in the capital market. However, the results do not provide evidence that CSR mediates the link between CEO narcissism and desirable organizational outcomes. The findings of this study build a better theoretical and practical understanding of the antecedents and consequences of CSR from the CEO's psychological personality perspective.
Biomass‐Derived Carbons for Sodium‐Ion Batteries and Sodium‐Ion Capacitors
Authors: Zhu Jianhui , Roscow James , Chandrasekaran Sundaram , Deng Libo , Zhang Peixin , He Tingshu , Wang Kuo , Huang Licong 
Published: February 2020

AbstractIn the past decade, the rapid development of portable electronic devices, electric vehicles, and electrical devices has stimulated extensive interest in fundamental research and the commercialization of electrochemical energy‐storage systems. Biomass‐derived carbon has garnered significant research attention as an efficient, inexpensive, and eco‐friendly active material for energy‐storage systems. Therefore, high‐performance carbonaceous materials, derived from renewable sources, have been utilized as electrode materials in sodium‐ion batteries and sodium‐ion capacitors. Herein, the charge‐storage mechanism and utilization of biomass‐derived carbon for sodium storage in batteries and capacitors are summarized. In particular, the structure–performance relationship of biomass‐derived carbon for sodium storage in the form of batteries and capacitors is discussed. Despite the fact that further research is required to optimize the process and application of biomass‐derived carbon in energy‐storage devices, the current review demonstrates the potential of carbonaceous materials for next‐generation sodium‐related energy‐storage applications.
Insight into the Superior Lithium Storage Properties of Ultrafine CoO Nanoparticles Confined in a 3 D Bimodal Ordered Mesoporous Carbon CMK‐9 Anode
Authors: Saikia Diganta , Deka Juti Rani , Lin Cheng‐Wei , Lai Yuan‐Hung , Zeng Yu‐Hao , Chen Po‐Hung , Kao Hsien‐Ming , Yang Yung‐Chin 
Published: February 2020

AbstractUltrafine CoO particles immobilized into the mesopores of three‐dimensional cubic bimodal ordered mesoporous carbon CMK‐9 is successfully prepared by using a combination of nanocasting and wet‐impregnation methods. It is found that the cubic bimodal interconnected mesoporous framework of CMK‐9 plays a crucial role in achieving the excellent electrochemical performances by assisting the rapid mass and charge transfer. Among the prepared nanocomposites, CoO(10)@CMK‐9 delivers a discharge capacity of 830 mAh g−1 after 200 cycles at a current density of 100 mA g−1 in lithium‐ion batteries. At a higher current density of 1000 mA g−1, the anode presents an outstanding discharge capacity of 636 mAh g−1 after 200 cycles. In sodium‐ion batteries, the anode provides a discharge capacity of 296 mAh g−1 after 250 cycles at a current density of 100 mA g−1. The remarkable performances of CoO(10)@CMK‐9 demonstrate the promising potentials of the nanocomposite as the anode for rechargeable batteries.
C2–H Arylation of Indoles Catalyzed by Palladium‐Containing Metal‐Organic‐Framework in γ‐Valerolactone
Authors: Anastasiou Ioannis , Van Velthoven Niels , Tomarelli Elena , Lombi Aurora , Lanari Daniela , Liu Pei , Bals Sara , De Vos Dirk E. , Vaccaro Luigi 
Published: February 2020

AbstractAn efficient and selective procedure was developed for the direct C2–H arylation of indoles using a Pd‐loaded metal–organic framework (MOF) as a heterogeneous catalyst and the nontoxic biomass‐derived solvent γ‐valerolactone (GVL) as a reaction medium. The developed method allows for excellent yields and C‐2 selectivity to be achieved and tolerates various substituents on the indole scaffold. The established conditions ensure the stability of the catalyst as well as recoverability, reusability, and low metal leaching into the solution.
Performance analysis and hardware implementation of a nearly optimal buffer management scheme for high‐performance shared‐memory switches
Authors: Zheng Ling , Pan Weitao , Li Yinghua , Gao Ya 
Published: February 2020

SummaryBurst traffic is a common traffic pattern in modern IP networks, and it may lead to the unfairness problem and seriously degrade the performance of switches and routers. From the perspective of switching mechanism, the majority of commercial switches adopt the on‐chip shared‐memory switching architecture, and high‐speed packet buffer with efficient queue management is required to deal with the unfairness and congestion problem. In this paper, the performance of a shared‐private buffer management scheme is analyzed in detail. In the proposed scheme, the total memory space is split into shared area and private area. Each output port has a private memory area that cannot be used by other ports. The shared area is completely shared among all output ports. A theoretical queuing model of the proposed scheme is formulated, and closed‐form formulas for multiple performance parameters are derived. Through the numerical studies, we demonstrate that a nearly optimal buffer partition policy can be obtained by setting an equally small amount of private area for each queue. This work is validated by simulations as well as hardware experiments. Software simulations show that the proposed scheme performs better than existing methods, and packet dropping caused by burst traffic can be significantly reduced. Besides, a prototype of the buffer management module is implemented and evaluated in field programmable gate array platform. The evaluation shows that the proposed scheme can ensure the efficiency and fairness while keeping a high throughput in real workload.
Mucinous breast carcinoma metastatic to thyroid gland: Report of a case diagnosed by fine‐needle aspiration cytology
Authors: Wang Meixian , Liu Xiulan , Wei Bing , Liu Nian , Li Qiyuan , Su Xueying 
Published: February 2020

AbstractMucinous breast cancer is a slow‐growing neoplasm, which has fewer lymph node metastases and favorable prognosis compared with invasive breast cancer no special type. The hematogenous spread of breast mucinous carcinoma is very rare. Though breast cancer involving thyroid has been reported before, there is still no report about thyroid metastatic breast mucinous carcinoma in the literature. Recently by performing thyroid fine‐needle aspiration, a 58‐year‐old woman who had breast cancer 13 years ago was diagnosed as thyroid metastatic mucinous breast carcinoma, cellular variant with neuroendocrine differentiation. For this patient, the thyroid was the only involved site without widespread metastatic diseases, so thyroidectomy and the right cervical lymph nodes dissection were performed to make better survival. As a result, the patient had not shown any signs of recurrence 9 months after the thyroid surgery.