bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Low‐Spin Three‐Coordinate Cobalt(I) Complex and Its Reactivity toward H2 and Silane
Authors: Choi Jonghoon , Lee Yunho 
Published: March 2019

AbstractA three‐coordinate low‐spin cobalt(I) complex generated using a pincer ligand is presented. Since an empty
orbital is sterically exposed at the site trans to the N donor of an acridane moiety, the cobalt(I) center accepts the coordination of various donors such as H2 and PhSiH3 revealing σ‐complex formation. At this low‐spin cobalt(I) site, homolysis of H–H and Si−H bonds preferentially occurs via bimolecular hydrogen atom transfer instead of two‐electron oxidative addition. When the resulting CoII–H species was exposed to N2, H2 evolution readily occurs at ambient conditions. These results suggest single‐electron processes are favored at the structurally rigidified cobalt center.
A Cation‐Exchange Approach for the Fabrication of Efficient Methylammonium Tin Iodide Perovskite Solar Cells
Authors: Li Fengzhu , Zhang Chaoshen , Huang Jin‐Hua , Fan Haochen , Wang Huijia , Wang Pengcheng , Zhan Chuanlang , Liu Cai‐Ming , Li Xiangjun , Yang Lian‐Ming , Song Yanlin , Jiang Ke‐Jian 
Published: March 2019

AbstractTin‐based halide perovskite materials have been successfully employed in lead‐free perovskite solar cells, but the overall power conversion efficiencies (PCEs) have been limited by the high carrier concentration from the facile oxidation of Sn2+ to Sn4+. Now a chemical route is developed for fabrication of high‐quality methylammonium tin iodide perovskite (MASnI3) films: hydrazinium tin iodide (HASnI3) perovskite film is first solution‐deposited using presursors hydrazinium iodide (HAI) and tin iodide (SnI2), and then transformed into MASnI3 via a cation displacement approach. With the two‐step process, a dense and uniform MASnI3 film is obtained with large grain sizes and high crystallization. Detrimental oxidation is suppressed by the hydrazine released from the film during the transformation. With the MASnI3 as light harvester, mesoporous perovskite solar cells were prepared, and a maximum power conversion efficiency (PCE) of 7.13 % is delivered with good reproducibility.
Moderately branched ultra‐high molecular weight polyethylene by using N,N′‐nickel catalysts adorned with sterically hindered dibenzocycloheptyl groups
Authors: Zada Muhammad , Guo Liwei , Zhang Randi , Zhang Wenjuan , Ma Yanping , Solan Gregory A. , Sun Yang , Sun Wen‐Hua 
Published: March 2019

Five examples of unsymmetrical 1,2‐bis (arylimino) acenaphthene (L1 – L5), each containing one N‐2,4‐bis (dibenzocycloheptyl)‐6‐methylphenyl group and one sterically and electronically variable N‐aryl group, have been used to prepare the N,N′‐nickel (II) halide complexes, [1‐[2,4‐{(C15H13}2–6‐MeC6H2N]‐2‐(ArN)C2C10H6]NiX2 (X = Br: Ar = 2,6‐Me2C6H3 Ni1, 2,6‐Et2C6H3 Ni2, 2,6‐i‐Pr2C6H3 Ni3, 2,4,6‐Me3C6H2 Ni4, 2,6‐Et2–4‐MeC6H2 Ni5) and (X = Cl: Ar = 2,6‐Me2C6H3 Ni6, 2,6‐Et2C6H3 Ni7, 2,6‐i‐Pr2C6H3 Ni8, 2,4,6‐Me3C6H2 Ni9, 2,6‐Et2–4‐MeC6H2 Ni10), in high yield. The molecular structures Ni3 and Ni7 highlight the extensive steric protection imparted by the ortho‐dibenzocycloheptyl group and the distorted tetrahedral geometry conferred to the nickel center. On activation with either Et2AlCl or MAO, Ni1 – Ni10 exhibited very high activities for ethylene polymerization with the least bulky Ni1 the most active (up to 1.06 × 107 g PE mol−1(Ni) h−1 with MAO). Notably, these sterically bulky catalysts have a propensity towards generating very high molecular weight polyethylene with moderate levels of branching and narrow dispersities with the most hindered Ni3 and Ni8 affording ultra‐high molecular weight material (up to 1.5 × 106 g mol−1). Indeed, both the activity and molecular weights of the resulting polyethylene are among the highest to be reported for this class of unsymmetrical 1,2‐bis (imino)acenaphthene‐nickel catalyst.
Synthesis and characterization of Ni (II), Cu (II), Fe (II) and Fe3O4 nanoparticle complexes with tetraaza macrocyclic Schiff base ligand for antimicrobial activity and cytotoxic activity against cancer and normal cells
Authors: Chaabane Laroussi , Chahdoura Hassiba , Moslah Wassim , Snoussi Mejdi , Beyou Emmanuel , Lahcini Mohammed , Srairi‐Abid Najet , Baouab Mohamed Hassen V. 
Published: March 2019

This work describes a simple synthesis of complexes of the type [M(C32H28N4)Cl2], where M = Ni (II), Cu (II) and Fe (II) and a novel complex of magnetite nanoparticle (Fe3O4NP) inside (INS) tetraaza macrocyclic Schiff base ligand (C32H28N4): [Fe3O4NP‐INS‐(C32H28N4)], which was prepared by using a novel co‐precipitation method of coordinated ferric ion (Fe3+) in the complex [Fe(C32H28N4)Cl2] under mild conditions. The synthesized compounds were characterized and compared with a various physic‐chemical techniques like: Fourier transform infrared (FT‐IR), ultraviolet–visible spectroscopic techniques (UV–Vis), 1‐dimensional (1D) 1H‐NMR, 13C‐NMR spectroscopic techniques, mass spectra, Powder X‐ray diffraction (PXRD), Vibrating sample magnetometer (VSM), Scanning electron microscopy (SEM), elemental analysis and molar conductance measurements. Furthermore, the highest saturation magnetization was 26.56 emu.g−1 obtained from [Fe3O4NP‐INS‐(C32H28N4)] (diameter of Fe3O4NPs~20.87 nm) that prove easy separation by an external magnetic field. In vitro screening of all the compounds against different species of bacteria and fungi shows that [Fe3O4NP‐INS‐(C32H28N4)] is effective against the tested strains as compared to the tetraaza macrocyclic ligand and selected complexes. The cytotoxic activity of the all compounds was also examined in 3 human tumor cell lines as U87, MDA‐MB‐231 and LS‐174. The complex [Fe3O4NP‐INS‐(C32H28N4)] shows moderate and strong cytotoxic activity against brain cancer, colon cancer and breast cancer (U87, MDA‐MB‐231 and LS‐174 respectively), without showing cytotoxicity towards peripheral blood mononucleocyte (PBMC) cells.
Porous polyurethane film fabricated via the breath figure approach for sustained drug release
Authors: Daban Gizem , Bayram Cem , Bozdoğan Betül , Denkbaş Emir Baki 
Published: March 2019

ABSTRACTThe breath figure (BF) method is an effective process for fabricating porous polymeric films. In this study, we fabricated porous polymer films from thermoplastic polyurethane (PU) through static BF with CHCl3 as a solvent under 55–80% relative humidity. The porous PU films were prepared within various pore structures and sizes, which were adjustable, depending on the fabrication conditions. The humidity and exposure time were examined as variable parameters affecting the surface morphology, wettability, and cytotoxicity. Atorvastatin calcium, a hyperlipidemic agent, was loaded into the porous films during the casting process, and the drug‐loading and drug‐releasing behaviors of the porous PU membranes were evaluated. Approximately 60–80% of the drug was released in 14 days. The films exhibited sustained drug‐release performances because of the hydrophobicity and nonbiodegradable nature of PU for perivascular drug administration. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47658.
Influence of reactive blending temperature on impact toughness and phase morphologies of PLA ternary blend system containing magnesium ionomer
Authors: Chen Qiu , Shan Pengjia , Tong Congcong , Yan Dongguang , Zhang Yan , Liu Hongzhi , Hao Chaowei 
Published: March 2019

ABSTRACTIn this study, effects of extrusion temperature on impact toughness and phase morphologies in the reactive poly(lactic acid) (PLA)/epoxy‐containing elastomer (ethylene/n‐butyl acrylate/glycidyl methacrylate [EBA‐GMA]) blend system with magnesium ionomer (magnesium ionomer of ethylene/methacrylic acid copolymer [EMAA‐Mg]), were investigated, and the underlying origin for the dependence of morphology development on reactive blending temperature was analyzed. The extent of reactive compatibilization between PLA/EBA‐GMA and crosslinking of EBA‐GMA initiated by EMAA‐Mg, were determined in terms of Fourier transform infrared spectra of dioxane‐extracted residues, torque rheometer, dynamic mechanical analysis, and gel contents after chloroform extraction. The phase morphologies were studied by electron microscopic observation and dynamic rheological tests. Compared to the ternary blend system containing zinc‐neutralized ionomer of EMAA copolymer (EMAA‐Zn), the ones containing EMAA‐Mg exhibited the less pronounced dependence of notched impact strength on extrusion temperature. With elevating extrusion temperature, the latter ternary blends exhibited different “salami‐like” dispersed phase structure. The morphology development with reactive blending temperature was attributed to the remarkable temperature dependence of crosslinking rate of EBA‐GMA phase initiated by the EMAA‐Mg rather than the difference in the extent of compatibilization. The morphology development mechanism with respect to reactive blending temperature was also discussed. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47682.
To sea or not to sea? Multiple lines of evidence reveal the contribution of non‐diadromous recruitment for supporting endemic fish populations within New Zealand's longest river
Authors: David Bruno O. , Jarvis Matt , Özkundakci Deniz , Collier Kevin J. , Hicks Andy S. , Reid Malcolm 
Published: March 2019

Abstract

Otolith microchemistry was used to identify marine‐ versus freshwater‐derived recruitment of three native freshwater fish species belonging to the southern hemisphere family Galaxiidae, in New Zealand's longest river system, the Waikato River.
Water chemistry data for trace elements and 87Sr/86Sr isotope ratios were collected from five lentic and 10 lotic water bodies throughout the lower river floodplain. Potential spawning sites for galaxiids were compared with values obtained by laser ablation inductively coupled mass spectrometry (LA‐ICPMS) depth profiling of young‐of‐the‐year otoliths sampled from fish in nine lower river catchment sites.
Otolith chemical signatures from the larval rearing period indicated that catchment‐scale recruitment for two species, Galaxias argenteus (Gmelin, 1789) and Galaxias fasciatus Gray, 1842, was driven predominantly by non‐diadromous recruitment from one lake (Lake Waahi). In contrast, diadromous recruitment appeared to be more common for Galaxias maculatus (Jenyns, 1842); however, non‐diadromous specimens were also identified for the first time from a New Zealand river.
Reversing lake outlet flows linked to river stage appears be important in facilitating the dispersal of rheotactic larvae out of lakes, suggesting that lake outflow management at key times could be used to sustain this ecologically important function.
This study highlights that some water bodies can supply a disproportionately large number of recruits to support fish populations within the wider riverscape. Identifying these water bodies and managing them to sustain recruitment is key to the conservation of non‐diadromous Galaxiidae in this modified lowland environment
3D Enantiomorphic Mg‐Based Metal–Organic Frameworks as Chemical Sensor of Nitrobenzene and Efficient Catalyst for CO2 Cycloaddition
Authors: Xue Yun‐Shan , Cheng Weiwei , Cao Jia‐Peng , Xu Yan 
Published: March 2019

AbstractTwo enantiomorphic MgII‐based metal‐organic frameworks, {MgL(H2O)2}n (1‐D and 1‐L) (where H2L=2,2′‐bipyridyl‐4,4′‐dicarboxylic acid) have been synthesized by solvothermal reaction without any chiral auxiliary. The single‐crystal X‐ray measurement and the structural analysis indicate that both 1‐D and 1‐L possess 2‐fold interpenetrated frameworks with different left‐ and right‐handed helical chains simultaneously, which serve as chiral source, thus transmitting chirality over the whole frameworks. The fluorescence measurements reveal that they exhibit a strong quenching response to nitrobenzene and could be potentially used as a chemical sensor. Owing to the accessible Lewis acidic sites in channels, they display high catalytic efficiency for cycloaddition reaction of CO2 with epoxides and could be reused five times without losing activity.
Nonlinear output feedback control of V2G single‐phase on‐board BEV charger
Authors: Rachid Aziz , El Fadil Hassan , Giri Fouad , Lassioui Abdellah 
Published: March 2019

AbstractIn this work, we consider the problem of controlling a single‐phase on‐board battery electric vehicle (BEV) charger with vehicle‐to‐grid (V2G) technology. The BEV charger consists of a bidirectional ac‐dc power converter connected to the single‐phase power grid, followed by a bidirectional dc‐dc power converter interfacing an EV battery pack. The main control objectives are fourfold: (i) Unitary Power Factor (UPF) in grid‐side; (ii) tight dc‐bus voltage regulation; (iii) safety battery charge and battery discharge during the grid‐to‐vehicle (G2V) mode and V2G mode, respectively; and (iv) asymptotic stability of the closed loop system. After an accurate system modelling, a nonlinear controller is designed using a backstepping design technique. The point is that the battery inner voltage is not accessible to measurement. Therefore, a nonlinear observer is invoked in order to estimate all non‐measured variables making the solution cheaper and noiseless. It is shown using a formal analysis and numerical simulations, that the proposed output feedback controller (combining a nonlinear controller and a nonlinear observer) meets all control objectives.
Recent Research on Strategies to Improve Ion Conduction in Alkali Metal‐Ion Batteries
Authors: Shao TieLei , Liu Chunyi , Deng Wenjun , Li Chang , Wang Xusheng , Xue Mianqi , Li Rui 
Published: March 2019

AbstractIon conduction refers to a conductive process consisting of the directional motion of ions driven by an electric field, which is one of the most important issues for further improvement of batteries in the current and foreseeable future. In order to better understand the conduction phenomena in alkali metal‐ion (Li+/Na+/K+) batteries (AMIBs) and achieve technological breakthroughs, the recent studies on the ion diffusion of electrode materials and the ion conduction of electrolytes for AMIBs are investigated. Three aspects of the factors that affecting ion conduction in AMIBs are mainly listed: (i) crystal structure related high ion conduction in crystalline materials. (ii) tuning the lattice volume and interface by doping and compounding. (iii) improvement in experimental synthesis and modification methods. Through this review, we hope to facilitate more efficient and targeted research to improve ion conduction in AMIBs.
Reviving Aged Lithium‐Ion Batteries and Prolonging their Cycle Life by Sinusoidal Waveform Charging Strategy
Authors: Chen Po‐Tuan , Yang Fang‐Haur , Cao Zhong‐Ting , Jhang Jyun‐Ming , Gao Hong‐Min , Yang Mo‐Hua , Huang K. David 
Published: March 2019

AbstractTraditional high power constant current‐constant voltage (CC−CV) charging leads to the degradation of Li‐ion batteries. Thus, aging due to charging is a primary issue to be overcome in application technology. This study proposes the impacts of a sinusoidal waveform charging strategy for charging Li‐ion batteries. Specifically, a negative voltage is introduced in the charging process to reverse passivation layer formation. After few cycles of sinusoidal waveform charging, aged cells can be revived. Tests reveal that the available capacity of an aged cell can be improved by a maximum of 18.7 % relative to the original rated power. After 600 charging‐discharging cycles of new cells, the cells charged using the sinusoidal waveform strategy possess approximately 15 % more electrical capacity than do cells charged using the conventional CC−CV method, indicating an increase in battery cycle life. The suppression of interfacial resistance is characterized by electrochemical impedance spectroscopy. Sinusoidal waveform charging can reduce charging time by half and the maximum rise in temperature by 6 °C compared with the CC−CV charging method.
A simple innovative spectrofluorometric method for the determination of alendronate in bulk and in pharmaceutical tablets
Authors: Elmalla Samah F. , Mansour Fotouh R. 
Published: March 2019

AbstractSodium alendronate is the first in a pharmacological class known as bisphosphonates, used for treatment of various bone diseases. Assay of bisphosphonates by a spectroscopic technique is very challenging due to the fact that they lack chromophores and none of them are fluorescent. In this work, a simple method is presented for determination of alendronate in bulk and in pharmaceutical tablets using spectrofluorometry by exploiting the ability of alendronate to displace salicylate from the iron(III)–salicylate chelate, forming a non‐fluorescent colorless iron(III)–alendronate complex. The liberated salicylate is fluorescent and is equivalent to the mount of alendronate added. The response was linear over the concentration range 20–90 μM and the proposed method was validated according to the guidelines of the International Conference on Harmonization. The correlation coefficient was found to be 0.995 and the limit of detection was 7.5 μM. The method was successfully applied for determination of alendronate in the commercially available Osteonate® tablets. The average percent recovery ± percent relative standard deviation was found to be 102.118 ± 2.033 which is congruent with the label claim of the dosage form. The results were also compared to a reported method using t‐test and F‐test at 95% confidence level; no significant differences were observed. The presented method is simple, fast, easy, cost‐effective and suitable for routine pharmaceutical analysis.
A software for considering leakage in water pressurized networks
Authors: Pardo Miguel , Riquelme Adrian 
Published: March 2019

AbstractA matlab‐based educational software (UAleaks) has been developed to consider the effect of water losses when solving the hydraulic problem in water pressurized networks. The results obtained are the new leaky network model and the water and energy audits calculation. This software can be used by students and practitioners.
Bilateral internal mammary artery laceration after cardiac pulmonary resuscitation
Authors: Morgan Jacob , Bolanos Alexander , Al‐Balas Hassan , Paniagua David 
Published: March 2019

AbstractCardiopulmonary resuscitation (CPR) is essential for the survival of cardiac arrest patients. High‐quality chest compressions are critical for survival, but energetic resuscitation efforts can lead to chest injuries. Internal mammary artery (IMA) injury is a rare complication of CPR, but can lead to life‐threatening intrathoracic hemorrhage. Early detection of IMA injury should be considered in all post cardiac arrest syndrome (PCAS) with anemia refractory to transfusion. To the best of our knowledge, no cases of CPR‐associated bilateral IMA laceration have ever been reported. We report a unique CPR complication resulting in anterior mediastinal hemorrhage that was detected by ECHO, verified by computed tomography angiography, and treated with endovascular intervention.
Peritonitis from Leclercia adecarboxylata: An emerging pathogen
Authors: Adapa Sreedhar , Konala Venu Madhav , Nawaz Faiza , Javed Tariq , Dhingra Hemant , Gutierrez Irene A. , Ramirez Magda L. 
Published: March 2019

Key Clinical MessageLeclercia adecarboxylata can be misidentified as Escherichia coli, due to similar biochemical properties. Automated identification systems and mass spectrometry play a very critical role in isolating atypical organisms like L adecarboxylata. General guidelines recommend treating L adecarboxylata peritonitis for 3 weeks without removal of peritoneal dialysis catheter.
Synthesis of All Stereoisomers of Monomeric Spectomycin A1/A2 and Evaluation of Their Protein SUMOylation‐Inhibitory Activity
Authors: Nomura Yusaku , Thuaud Frédéric , Sekine Daisuke , Ito Akihiro , Maeda Satoko , Koshino Hiroyuki , Hashizume Daisuke , Muranaka Atsuya , Cruchter Thomas , Uchiyama Masanobu , Ichikawa Satoshi , Matsuda Akira , Yoshida Minoru , Hirai Go , Sodeoka Mikiko 
Published: March 2019

AbstractA synthetic methodology to access all possible stereoisomers of spectomycin A1 (SMA1) and A2 (SMA2) has been established through late‐stage diversification. The key reaction for the construction of all four diastereomers is an intramolecular cyclization based on the umpolung of π‐allyl palladium species with bis(pinacolato)diborane (B2(pin)2). Silyl group assisted direct benzylic oxidation of each isomer enabled construction of the fragile β‐hydroxytetralone skeleton to provide the SMAs. The relative and absolute stereochemistry of SMA2 was also determined, and the absolute stereochemistry of SMA1 was extrapolated based on the optical rotation of SMA2. The axial chirality of SMAs is discussed based on circular dichroism spectra and DFT calculations, and it is concluded that the M isomer is predominant in solution. Biochemical assessment of all isomers in vitro revealed that the C9 hydroxyl group and dimeric structure were both important for protein SUMOylation‐inhibitory activity.
Analyzing smart contract interactions and contract level state consensus
Authors: Hu Yao‐Chieh , Lee Ting‐Ting , Chatzopoulos Dimitris , Hui Pan 
Published: March 2019

SummaryAlthough the primary function of distributed ledgers is to store data related to users' interactions, their capabilities allow them to offer more sophisticated functionalities. Advances in blockchain technologies introduced smart contracts, software programs that define immutable rules as functions stored on the blockchain and can be executed on demand. Smart contracts can interact not only with users but also with each other via message exchange. We compare existing smart contract interactions, and develop an architecture for asynchronous state consensus, a novel type of smart contract interaction required in applications but had rarely been addressed. The proposed architecture is composed of two types of smart contracts, ie, Custodian and Client. Client smart contracts serve as network participants reaching a particular consensus collectively by forming a cluster and issuing votes towards a final state agreement. Custodian smart contracts serve as the arbiters that aggregate and calculate voting results as the finalized state consensus that is shared across the network. To test the feasibility of our proposal, we conduct experiments on the consensus reaching latency and the scalability under different network configurations with standardized Amazon Web Service instances. Lastly, we discuss the robustness our proposal concerning Byzantine Fault tolerance and list possible applications. In the gaming industry, an ERC721 smart contract does not allow contrasting structural features between individual tokens, yet only minor value‐level differences. The proposed solution can address the need for character diversity that characters can be created and attached to a gaming smart contract after deployment, which enables fine distinction between characters. The proposal can also achieve sharing states across smart contracts, such as the jackpot, which renovates the flexibility of blockchain gaming.