bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development of multiwalled‐carbon‐nanotube‐welded carbon fibers and evaluation of the interfacial strength in epoxy composites
Authors: Hu Yu Fei , Wang Biao , Zhang Xue Na , Zhang Jian , Zhu Jin 
Published: March 2017

ABSTRACTMultiwalled carbon nanotube (MWCNT)‐welded carbon fibers (CFs) were prepared by a three‐step process, which included polyacrylonitrile (PAN) coating, MWCNT absorption, and heat treatment. The structure of these materials was characterized by scanning electron microscopy, Fourier‐transform infrared spectroscopy, and Raman spectroscopy. The MWCNTs were uniformly assembled on the surface of the PAN‐coated CFs and welded by a PAN‐based carbon layer after heat treatment. The contact angle of the MWCNT‐welded CFs in the epoxy resins was 41.70°; this was 22.35% smaller than that of the unsized CFs. The interfacial shear strength (IFSS) of the MWCNT‐welded CF–epoxy composite was 83.15 MPa; this was 28.89% higher than that of the unsized CF–epoxy composite. The increase in the IFSS was attributed to the enhancement of adhesions between the CFs and polymer matrix through the welding of the MWCNTs on the CFs. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45027.
Short‐term results of alcohol septal ablation as a bail‐out strategy to treat severe left ventricular outflow tract obstruction after transcatheter mitral valve replacement in patients with severe mitral annular calcification
Authors: Guerrero Mayra , Wang Dee Dee , Himbert Dominique , Urena Marina , Pursnani Amit , Kaddissi Georges , Iyer Vijay , Salinger Michael , Chakravarty Tarun , Greenbaum Adam , Makkar Raj , Vahanian Alec , Feldman Ted , O'Neill William 
Published: March 2017

ObjectivesTo evaluate the outcomes of the early experience of percutaneous alcohol septal ablation in patients with severe left ventricular outflow tract (LVOT) obstruction post transcatheter mitral valve replacement (TMVR).BackgroundSevere LVOT obstruction with hemodynamic compromise is a complication of TMVR associated with high mortality. Percutaneous alcohol septal ablation has recently been described as a therapeutic option in this setting.MethodsMulticenter retrospective review of clinical outcomes of patients undergoing alcohol septal ablation to treat LVOT obstruction after TMVR for severe mitral stenosis with severe mitral annular calcification.ResultsSix patients underwent percutaneous alcohol septal ablation to treat LVOT obstruction post‐TMVR at six different centers. Five patients had immediate significant reduction in LVOT obstruction with improvement in hemodynamic status while one had persistent LVOT gradient but hemodynamic instability improved. The first patient died on postoperative day 4 due to complete heart block. One patient had initial improvement in LVOT gradient with recurrence on postoperative day 1 thought to be secondary to septal edema, was treated with surgical removal of the transcatheter valve and resection of the anterior mitral leaflet followed by transatrial TMVR and died 3 weeks later due to multi‐organ failure. The remaining four patients improved clinically after alcohol septal ablation, were discharged from the hospital and were clinically stable at 30‐day follow‐up.ConclusionsPercutaneous alcohol ablation provides acute relief of TMVR‐induced LVOT obstruction when septal hypertrophy is a contributing factor. This may be a safer alternative to bail‐out surgery in this extremely high‐risk patient population. © 2017 Wiley Periodicals, Inc.
2‐(Pyridinium‐1‐yl)‐1,1‐bis(perfluoroalkylsulfonyl)ethan‐1‐ide: A Practical Reagent for Synthesis of Strongly Acidic 1,1‐Bis(perfluoroalkylsulfonyl)alkanes
Authors: Yanai Hikaru , Takahashi Ryuta , Takahashi Yoichi , Kotani Akira , Hakamata Hideki , Matsumoto Takashi 
Published: March 2017

AbstractOn mixing (RfSO2)2CH2 (Rf=perfluoroalkyl), paraformaldehyde, and substituted pyridines, a three‐component reaction proceeded smoothly to give unusual zwitterions bearing both pyridinium and stabilized carbanion moieties in good to excellent yields. Of these, 2‐fluoropyridinium derivatives rapidly dissociated in acetonitrile to give equilibrium mixtures of the zwitterions and (RfSO2)2C=CH2/2‐fluoropyridine, as confirmed by detailed variable‐temperature NMR studies. The dynamic behavior of such 2‐fluoropyridinium compounds allows them to be used as shelf‐stable, easy‐to‐handle sources of (RfSO2)2C=CH2. With these reagents, strongly acidic carbon acids (RfSO2)2CHR were synthesized, which served as a new type of acid catalysts. Moreover, C−C bond‐forming reactions with a ketene silyl acetal proceeded efficiently with Tf2C=CH2 generated in situ.
Synthesis and Characterisation of Chiral Triazole‐Based Halogen‐Bond Donors: Halogen Bonds in the Solid State and in Solution
Authors: Kaasik Mikk , Kaabel Sandra , Kriis Kadri , Järving Ivar , Aav Riina , Rissanen Kari , Kanger Tõnis 
Published: March 2017

AbstractA general platform for the synthesis of various chiral halogen‐bond (XB) donors based on the triazole core and the characterisation of factors that influence the strength of the halogen bond in the solid state and in solution are reported. The characterisation of XB donors in the solid state by X‐ray crystallography and in solution by 1H NMR titration can be used to aid the design of new XB donors. We describe the first example of a XB between iodotriazoles and thioureas in solution. In addition, the enantiodiscrimination of acceptors in solution through halogen‐bond participation is described.
On the Importance of π‐Hole Beryllium Bonds: Theoretical Study and Biological Implications
Authors: Bauzá Antonio , Frontera Antonio 
Published: March 2017

AbstractIn this study, the ability of beryllium compounds to establish π‐hole bonding interactions has been evaluated at the RI‐MP2/def2‐TZVPD level of theory. A search of the Protein Data Bank revealed some X‐ray crystal structures in which BeF3− moieties act as electron‐acceptor entities. We have used [Mg(BeF3)(HCOO)] (1) as a π‐hole bond donor and CO, CH3CN, NH3, O(CH3)2, S(CH3)2, H3PO, and glycine as electron‐rich entities. In all cases, favorable binding energies were obtained, reflecting the attractive nature of the interaction involving the trivalent beryllium atom (‐BeF3 moiety). In addition, we have used Bader's theory of “atoms in molecules” and noncovalent interaction (NCI) plot analysis to further investigate and characterize the π‐hole complexes described herein. To the best of our knowledge, π‐hole interactions involving beryllium have not hitherto been described in the literature.
Breaking the Dogma of Aldolase Specificity: Simple Aliphatic Ketones and Aldehydes are Nucleophiles for Fructose‐6‐phosphate Aldolase
Authors: Roldán Raquel , Sanchez‐Moreno Israel , Scheidt Thomas , Hélaine Virgil , Lemaire Marielle , Parella Teodor , Clapés Pere , Fessner Wolf‐Dieter , Guérard‐Hélaine Christine 
Published: March 2017

Abstractd‐Fructose‐6‐phosphate aldolase (FSA) was probed for extended nucleophile promiscuity by using a series of fluorogenic substrates to reveal retro‐aldol activity. Four nucleophiles ethanal, propanone, butanone, and cyclopentanone were subsequently confirmed to be non‐natural substrates in the synthesis direction using the wild‐type enzyme and its D6H variant. This exceptional widening of the nucleophile substrate scope offers a rapid entry, in good yields and high stereoselectivity, to less oxygenated alkyl ketones and aldehydes, which was hitherto impossible.
Biosynthesized Gold/Activated Carbon Catalyst for Aerobic Glucose Oxidation: Influence of Acid Treatment on Activated Carbon
Authors: Lu Fenfen , Xu Yan , Jiang Xia , Sun Daohua , Li Qingbiao 
Published: March 2017

AbstractThe biosynthesized gold/activated carbon catalysts for glucose oxidation were prepared with Cacumen platycladi leaves extract, and activated carbon (AC) was modified with hydrochloric acid and nitric acid to modify its surface chemistry and used as supports. The catalysts with acid‐treated AC exhibited improving activity for the selective oxidation of glucose, when compared to that with untreated one. In order to investigate the influence of the acid treatment for the catalysts performance, the surface chemical properties of AC were characterized by Brunauer‐ Emmett‐Teller surface area characterization, Boehm titration, X‐ray photoelectron spectroscopy and Fourier transform infrared spectroscopy, respectively. The dispersion of AuNPs on AC was observed by transmission electron microscopy and X‐ray diffraction. The results indicated that the catalysts with acid treated supports showed improved dispersion than that of untreated one, which may be the result that the supports significantly increase the surface functional groups and remove the ash after acid treatment.
New Dopa‐AIE Compound Used as Fluorescence Sensor Material: Specificity and Quantification for Cu(II)
Authors: Liu Siwei , Cheng Jing , Xu Jiarui 
Published: March 2017

AbstractAs a paramagnetic metal ion, Cu(II) is challenging to be detected by conventional fluorescence sensor because of its unselective paramagnetic quenching effects on common fluorophores. By combining catechol with tetraphenylethene, a typical aggregation‐induced emission (AIE) moiety, we have successfully synthesized a new kind of catechol, the dopa‐AIE compound. Due to the properties of AIE core, the catechol has the “turn on” mechanism as a fluorescence chemosensor. Specifically, the new catechol has the unique detection selectivity on Cu(II) in solution. The fluorescence intensity has the maximum value when the molar ratio of the catechol to Cu(II) is 1∶1. Before and after this point, the fluorescence intensity shows a linear relationship with the copper ion concentration, increasing or decreasing. Thus, the quantitative calculation for Cu(II) or the dopa‐AIE compound could be done according to this response process.
Anticancer Activity of Stilbene‐Based Derivatives
Authors: De Filippis Barbara , Ammazzalorso Alessandra , Fantacuzzi Marialuigia , Giampietro Letizia , Maccallini Cristina , Amoroso Rosa 
Published: March 2017

AbstractStilbene is an abundant structural scaffold in nature, and stilbene‐based compounds have been widely reported for their biological activity. Notably, (E)‐resveratrol and its natural stilbene‐containing derivatives have been extensively investigated as cardioprotective, potent antioxidant, anti‐inflammatory, and anticancer agents. Starting from its potent chemotherapeutic activity against a wide variety of cancers, the stilbene scaffold has been subject to synthetic manipulations with the aim of obtaining new analogues with improved anticancer activity and better bioavailability. Within the last decade, the majority of new synthetic stilbene derivatives have demonstrated significant anticancer activity against a large number of cancer cell lines, depending on the type and position of substituents on the stilbene skeleton. This review focuses on the structure–activity relationship of the key compounds containing a stilbene scaffold and describes how the structural modifications affect their anticancer activity.
A survey on load balancing algorithms for virtual machines placement in cloud computing
Authors: Xu Minxian , Tian Wenhong , Buyya Rajkumar 
Published: March 2017

SummaryThe emergence of cloud computing based on virtualization technologies brings huge opportunities to host virtual resource at low cost without the need of owning any infrastructure. Virtualization technologies enable users to acquire, configure, and be charged on pay‐per‐use basis. However, cloud data centers mostly comprise heterogeneous commodity servers hosting multiple virtual machines (VMs) with potential various specifications and fluctuating resource usages, which may cause imbalanced resource utilization within servers that may lead to performance degradation and service level agreements violations. So as to achieve efficient scheduling, these challenges should be addressed and solved by using load balancing strategies, which have been proved to be nondeterministic polynomial time (NP)‐hard problem. From multiple perspectives, this work identifies the challenges and analyzes existing algorithms for allocating VMs to hosts in infrastructure clouds, especially focuses on load balancing. A detailed classification targeting load balancing algorithms for VM placement in cloud data centers is investigated, and the surveyed algorithms are classified according to the classification. The goal of this paper is to provide a comprehensive and comparative understanding of existing literature and aid researchers by providing an insight for potential future enhancements.
Corporate Social Responsibility and Gender Diversity: Insights from Asia Pacific
Authors: Yasser Qaiser Rafique , Al Mamun Abdullah , Ahmed Irfan 
Published: March 2017

AbstractA growing body of empirical evidence suggests a positive link between boardroom gender diversity and corporate social responsibility (CSR) performance in developed economy firms. However, there is a paucity of evidence regarding whether this relationship holds true for developing economy firms. Relying on stakeholder and institutional theory, this study examines for a positive link between board gender diversity and enhanced corporate social performance of firms across three Asia Pacific emerging economies (Malaysia, Pakistan, and Thailand). We find a significant relationship between board gender diversity and enhanced adoption of CSR in these emerging markets. Given that emerging societies and their environments are often the most vulnerable to unethical corporate practices, our finding that female directors can play a strategic role in enabling firms to ethically manage their social responsibilities and sustainable practices has important policy implications for regulators and stakeholders. Copyright © 2017 John Wiley & Sons, Ltd and ERP Environment
Climate change may restrict dryland forest regeneration in the 21st century
Authors: Petrie M. D. , Bradford J. B. , Hubbard R. M. , Lauenroth W. K. , Andrews C. M. , Schlaepfer D. R. 
Published: March 2017

AbstractThe persistence and geographic expansion of dryland forests in the 21st century will be influenced by how climate change supports the demographic processes associated with tree regeneration. Yet, the way that climate change may alter regeneration is unclear. We developed a quantitative framework that estimates forest regeneration potential (RP) as a function of key environmental conditions for ponderosa pine, a key dryland forest species. We integrated meteorological data and climate projections for 47 ponderosa pine forest sites across the western United States, and evaluated RP using an ecosystem water balance model. Our primary goal was to contrast conditions supporting regeneration among historical, mid‐21st century and late‐21st century time frames. Future climatic conditions supported 50% higher RP in 2020–2059 relative to 1910–2014. As temperatures increased more substantially in 2060–2099, seedling survival decreased, RP declined by 50%, and the frequency of years with very low RP increased from 25% to 58%. Thus, climate change may initially support higher RP and increase the likelihood of successful regeneration events, yet will ultimately reduce average RP and the frequency of years with moderate climate support of regeneration. Our results suggest that climate change alone may begin to restrict the persistence and expansion of dryland forests by limiting seedling survival in the late 21st century.
Research on Maximizing Power Transfer Efficiency of Wireless In‐Wheel Motor by Primary and Load‐Side Voltage Control
Authors: YAMAMOTO GAKU , GUNJI DAISUKE , IMURA TAKEHIRO , FUJIMOTO HIROSHI 
Published: March 2017

SUMMARYThe authors have developed a wireless power transfer (WPT) system for an in‐wheel motor (IWM). It is called a wireless in‐wheel motor (W‐IWM). This paper presents a method that enhances the WPT efficiency in this system. Some methods that maximize the power transfer efficiency by power converter control have been proposed in the past WPT research. In this research, a dc‐dc converter is inserted on the receiver side to vary the load state. However, the space on the receiver side is very small for the W‐IWM; therefore, it is preferable to make the secondary circuit small. Therefore, a full bridge converter is used instead of a dc‐dc converter in the W‐IWM. In this paper, the authors propose a theoretical formula for the transfer efficiency of the IW‐IWM. From an analysis of this formula, there is a combination of a primary voltage and load voltage that maximize the efficiency. The feasibility is validated by an experiment using a motor bench set.
The evaluation of the diffuse interface method for phase change simulations using OpenFOAM
Authors: Samkhaniani Nima , Ansari Mohamad Reza 
Published: March 2017

AbstractIn the present study, a new solver named phaseChangeHeatFoam is implemented on the OpenFOAM cfd package to simulate boiling and condensation. The solver is capturing the interface between two immiscible phases with a color function volume of fluid (CF‐VOF) method. The two fluids (vapor and liquid) are assumed Newtonian and incompressible. The surface tension is modeled with continuous surface force (CSF) which is improved with a Lafaurie filter to suppress the spurious current. The mass flux across the interface in the phase change process is determined by either Lee or Tanasawa mass transfer models. Additionally, the slight variation of saturation temperature with local pressure is considered with the simplified Clausius–Clapeyron relation. The coupled velocity pressure equation is solved using the PIMPLE algorithm. The new solver is validated and examined with (i) Stefan problem, (ii) two‐dimensional film boiling, (iii) the film condensation on a horizontal plate, (iv) the laminar film condensation over a vertical plate, and (v) bubble condensation in subcooled boiling. The present study shows the capability of a diffuse interface method in accurate simulation of the phase change process and it is expected to be instructive for further numerical studies in this area.
Large Subgraphs in Rainbow‐Triangle Free Colorings
Authors: Wagner Adam Zsolt 
Published: March 2017

AbstractFox–Grinshpun–Pach showed that every 3‐coloring of the complete graph on n vertices without a rainbow triangle contains a clique of size that uses at most two colors, and this bound is tight up to the constant factor. We show that if instead of looking for large cliques one only tries to find subgraphs of large chromatic number, one can do much better. We show that every such coloring contains a 2‐colored subgraph with chromatic number at least , and this is best possible. We further show that for fixed positive integers with , every r‐coloring of the edges of the complete graph on n vertices without a rainbow triangle contains a subgraph that uses at most s colors and has chromatic number at least , and this is best possible. Fox–Grinshpun–Pach previously showed a clique version of this result. As a direct corollary of our result we obtain a generalization of the celebrated theorem of Erdős‐Szekeres, which states that any sequence of n numbers contains a monotone subsequence of length at least . We prove that if an r‐coloring of the edges of an n‐vertex tournament does not contain a rainbow triangle then there is an s‐colored directed path on vertices, which is best possible. This gives a partial answer to a question of Loh.
Isms and schisms: A meta‐analysis of the prejudice‐discrimination relationship across racism, sexism, and ageism
Authors: Jones Kristen P. , Sabat Isaac E. , King Eden B. , Ahmad Afra , McCausland Tracy C. , Chen Tiffani 
Published: March 2017

SummaryRacism, sexism, and ageism persist in modern day organizations and may translate into workplace discrimination, which can undermine organizational effectiveness. We provide the first meta‐analysis comparing the relationships between these three types of prejudice (racism, sexism, and ageism) and three types of workplace discrimination (selection, performance evaluation, and opposition to diversity‐supportive policies). Across outcomes, racism was associated with workplace discrimination, whereas sexism was not. Ageism was associated with discriminatory selection and opposition to organizational policies supporting older workers; however, ageism was not related to discriminatory performance evaluation. Consistent with prior research and theory, Implicit Association Test measures were related to subtle discrimination (opposition to diversity‐supportive policies) but not deliberate discrimination (selection and performance evaluation). Finally, prejudice was more strongly associated with discrimination against real as compared with hypothetical targets. Implications for organizational researchers and practitioners are discussed. Copyright © 2017 John Wiley & Sons, Ltd.
Introduction of a coiled solid‐phase microextraction fiber based on a coating of animal bone waste for chromatographic analysis
Authors: Razmi Habib , Farrokhzadeh Samaneh 
Published: March 2017

We attempt to introduce animal bone waste as a coating material with an organic−inorganic structure for the fabrication of a coiled solid‐phase microextraction fiber for the first time. The coiled fiber was simply prepared with the use of copper wire and coated with bone waste suspension through the dip‐coating method. The bone waste coating was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and X‐ray diffraction analysis. It was applied as new type of solid‐phase microextraction fiber for preconcentration of polycyclic aromatic hydrocarbons before determination by high‐performance liquid chromatography with UV detection. A wide linear range 0.01–99.0 μg/L and limits of detection in the range 3.0–11.1 ng/L were obtained at optimized conditions. The bone waste coated coiled solid‐phase microextraction fiber has promise in sample preparation techniques because it is cost effective, available, stable in aqueous and organic solutions, environmentally friendly, and easy to fabricate and operate.
Pipette‐tip solid‐phase extraction based on deep eutectic solvent modified graphene for the determination of sulfamerazine in river water
Authors: Liu Lingling , Tang Weiyang , Tang Baokun , Han Dandan , Row Kyung Ho , Zhu Tao 
Published: March 2017

A green and novel deep eutectic solvent modified graphene was prepared and used as a neutral adsorbent for the rapid determination of sulfamerazine in a river water sample by pipette‐tip solid‐phase extraction. Compared with conventional graphene, deep eutectic solvent modified graphene can change the surface of graphene with wrinkled structure and higher selective extraction ability. The properties of deep eutectic solvent modified graphene and graphene were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. Static adsorption showed deep eutectic solvent modified graphene had a higher adsorption ability (18.62 mg/g) than graphene. Under the optimum conditions, factors such as kinds of washing solvents and elution solvents and volume of elution solvent were evaluated. The limits of detection and quantification were 0.01 and 0.03 μg/mL, respectively. The method recoveries of sulfamerazine were in the range of 91.01–96.82% with associated intraday relative standard deviations ranging from 1.63 to 3.46% and interday relative standard deviations ranging from 0.68 to 3.84%. Deep eutectic solvent modified graphene showed satisfactory results (recovery was 95.38%) and potential for rapid purification of sulfamerazine in river water sample in combination with the pipette‐tip solid‐phase extraction method.