bluuebunny/crossref_metadata_2025_split huggingface dataset:
Hot‐air aging failure mechanisms of carbonyl iron powder/methyl vinyl silicone rubber microwave‐absorbing materials
Authors: Zhang Yuhong , Xu Jingfeng , Feng Yongbao , Qiu Tai 
Published: July 2018

AbstractA rubber microwave‐absorbing material was prepared by compounding methyl vinyl silicone rubber (VMQ) and 45 vol% carbonyl iron powder (CIP). When used in a high‐temperature environment at long periods, the material undergoes thermal aging and rapid degradation. This work mainly aimed to investigate the thermal behavior and aging failure mechanisms of such material during hot‐air aging at 200°C. The mechanical and electromagnetic properties were measured with an electronic tensile testing machine and a network analyzer, respectively. Results indicate that CIP was oxidized by oxygen in the aging process and produced reactive oxygen species, which catalyzed the cross‐linking of VMQ. The increased cross‐linking density changed the mechanical properties and enhanced the thermal stability of the CIP/VMQ composite‐absorbing material. Thermal aging gradually penetrated the surface and proceeded into the interior of the material. The microwave‐absorbing properties deteriorated after hot‐air aging.
Impact of bitter taste receptor phenotype upon clinical presentation in chronic rhinosinusitis
Authors: Rowan Nicholas R. , Soler Zachary M. , Othieno Florence , Storck Kristina A. , Smith Timothy L. , Schlosser Rodney J. 
Published: July 2018

BackgroundGenetic variation of the bitter taste receptor T2R38 has been associated with recalcitrant chronic rhinosinusitis (CRS). Specific T2R38 polymorphisms, correlating with bitter taste sensitivity to phenylthiocarbamide (PTC), have been identified as an independent risk factor for surgical intervention in CRS patients without polyps; however, the exact role of PTC tasting ability in clinical practice remains unknown. In this investigation we characterize PTC taste sensitivity in a tertiary care rhinology practice with pertinent clinical measures of disease and quality of life (QOL).MethodsAdult CRS patients were prospectively assessed for their ability to taste PTC and categorized as nontasters, tasters, or supertasters. Objective taste was assessed with strips for bitter, sweet, sour, and salty, whereas olfactory testing was measured with Sniffin’ Sticks. Correlation was performed between PTC tasting ability and patient demographics, endoscopy scores, validated QOL surveys, and both subjective and objective measures of taste and olfaction.ResultsSixty‐seven patients were enrolled. Fifty‐two percent were identified as nontasters, 34% as tasters, and 13% as supertasters. Nontasters were more likely to be non‐Hispanic (p = 0.018), white (p = 0.027), without nasal polyposis (p = 0.004), and nonasthmatics (p = 0.019). There were no other statistical differences in patients’ demographics, QOL measures, and subjective or objective olfactory and taste scores when compared with patients’ oral PTC‐sensing ability.ConclusionOral PTC‐sensing ability may serve as a convenient marker of increased disease severity in white CRS patients without polyps and vary among regional populations. PTC tasting ability appears to provide unique phenotypic information not obtained using other subjective or objective measures of smell and taste.
Robust Ultramicroporous Metal–Organic Frameworks with Benchmark Affinity for Acetylene
Authors: Peng Yun‐Lei , Pham Tony , Li Pengfei , Wang Ting , Chen Yao , Chen Kai‐Jie , Forrest Katherine A. , Space Brian , Cheng Peng , Zaworotko Michael J. , Zhang Zhenjie 
Published: July 2018

AbstractHighly selective separation and/or purification of acetylene from various gas mixtures is a relevant and difficult challenge that currently requires costly and energy‐intensive chemisorption processes. Two ultramicroporous metal–organic framework physisorbents, NKMOF‐1‐M (M=Cu or Ni), offer high hydrolytic stability and benchmark selectivity towards acetylene versus several gases at ambient temperature. The performance of NKMOF‐1‐M is attributed to their exceptional acetylene binding affinity as revealed by modelling and several experimental studies: in situ single‐crystal X‐ray diffraction, FTIR, and gas mixture breakthrough tests. NKMOF‐1‐M exhibit better low‐pressure uptake than existing physisorbents and possesses the highest selectivities yet reported for C2H2/CO2 and C2H2/CH4. The performance of NKMOF‐1‐M is not driven by the same mechanism as current benchmark physisorbents that rely on pore walls lined by inorganic anions.
Boron(II) Cations: Interplay between Lewis‐Pair‐Acceptor and Electron‐Donor Properties
Authors: Widera Anna , Vogler Daniel , Wadepohl Hubert , Kaifer Elisabeth , Himmel Hans‐Jörg 
Published: July 2018

AbstractBoron(III) cations are widely used as highly Lewis acidic reagents in synthetic chemistry. In contrast, boron(II) cations are extremely rare and their chemistry almost completely unknown. They are both Lewis acids and electron donors, properties that are commonly associated with catalytically active late‐transition‐metal complexes. This double reactivity pattern ensures a rich and diverse chemistry. Herein we report the facile synthesis of several new boron(II) cations starting with a special diborane with two easily exchangeable triflate substituents. By increasing the π‐acceptor character of the neutral σ‐donor reaction partners, first reactions were developed in which the combined Lewis acidity and electron‐donor properties of boron(II) cations are applied for the reduction of organic molecules. The results of our study pave the way for applications of these unusual compounds in synthetic chemistry.
Noble‐Metal‐Free Single‐Atom Catalysts CuAl4O7–9− for CO Oxidation by O2
Authors: Zou Xiu‐Ping , Wang Li‐Na , Li Xiao‐Na , Liu Qing‐Yu , Zhao Yan‐Xia , Ma Tong‐Mei , He Sheng‐Gui 
Published: July 2018

AbstractThe single copper atom doped clusters CuAl4O7–9− can catalyze CO oxidation by O2. The CuAl4O7–9− clusters are the first group of experimentally identified noble‐metal free single atom catalysts for such a prototypical reaction. The reactions were characterized by mass spectrometry and density functional theory calculations. The CuAl4O9CO− is much more reactive than CuAl4O9− in the reaction with CO to generate CO2. One adsorbed CO is crucial to stabilize Cu of CuAl4O9− around +I oxidation state and promote the oxidation of another CO. The widely emphasized correlation between the catalytic reactivity of CO oxidation and Cu oxidation state can be understood at the strictly molecular level. The remarkable difference between Cu catalysis and noble‐metal catalysis was discussed.
Synthesis of diaryl sulfides via nickel ferrite‐catalysed C─S bond formation in green media
Authors: Farzin Shiva , Rahimi Abdollah , Amiri Kamran , Rostami Abed , Rostami Amin 
Published: July 2018

NiFe2O4 magnetic nanoparticles (MNPs) were synthesized, characterized and applied as an air‐stable, inexpensive and magnetically separable nanocatalyst for the synthesis of structurally diverse sulfides. Efficient methodologies were developed for the synthesis of unsymmetric diaryl sulfides via odourless and one‐pot reactions of triphenyltin chloride/S8 or arylboronic acid/S8 as thiolating agents with aryl halides or nitroarenes as starting materials in the presence of base (K2CO3 or NaOH) and NiFe2O4 MNPs as a catalyst in water or poly (ethylene glycol) as solvent at 80–110 °C. Free from ligand and the unpleasant smell of thiols and with the use of magnetically reusable nanocatalyst, green solvents and commercially available and cheap sulfur source and starting materials, these methods are more eco‐friendly and practical than available protocols for the synthesis of sulfides.
Structure–reactivity studies of chloro and isothiocyanato diorganotin (IV) complexes based on multidentate N‐donor ligands: Synthesis, spectral characterization and crystal structures
Authors: Momeni Badri Z. , Sefidabi Farzaneh , Khademi Saghi , Fathi Nastaran 
Published: July 2018

The reaction of [SnMe2Cl2] with the bidentate ligand 4,7‐phenanthroline (4,7‐phen) resulted in the formation of [SnMe2Cl2 (4,7‐phen)]n (1a) which is probably a polymeric chain in solution. On the other hand, the reaction of [SnEt2Cl2] with 4,7‐phen afforded the complex [Sn2Et4Cl4 (κ1‐N‐4,7‐phen)2(μ‐κ2‐N,N‐4,7‐phen)] (1b) which dissociates in dimethylsulfoxide solution. The reaction of [SnR2Cl2] (R = Me, Et) with 2,2′‐biquinoline (biq) yielded the complexes [SnMe2Cl2 (κ2‐N,N‐biq)] (2a) and [SnEt2Cl2 (κ1‐N‐biq)2] (2b) in the solid state. Moreover, the reaction of [SnR2Cl2] (R = Me, Et) with the tridentate ligand 4′‐(2‐furyl)‐2,2′:6′,2″‐terpyridine (ftpy) resulted in the formation of ionic penta‐ and hexa‐coordinated tin complexes [SnMe2Cl (ftpy)][SnMe2Cl3] (3a) and [SnEt2Cl (ftpy)]Cl (3b). The reaction of [SnMe2 (NCS)2] with ftpy afforded the hepta‐coordinated complex [SnMe2 (NCS)2(ftpy)] (4a). The products were fully characterized using elemental analysis, and infrared, UV–visible, multinuclear (1H, 13C, 119Sn) NMR, DEPT‐135°, HH‐COSY and HSQC NMR spectroscopies. The crystal structure of complex 3a reveals that it contains the simultaneous presence of penta‐ and hexa‐coordinated tin (IV) atoms. Notably, the crystal structure of complex 4a shows that tin (IV) is hepta‐coordinated in a pentagonal bipyramidal geometry SnC2N5 by three nitrogen atoms of ftpy, two nitrogen atoms of NCS− and two Me groups with trans‐[SnMe2] configuration. These data indicate the influence of halide or pseudo‐halide group on the coordination number and geometry of tin. Hirshfeld surface analysis and two‐dimensional fingerprint plots were calculated for 3a and 4a which show the π–π interaction between molecules in the solid is relatively weak.
Rheological and thermal behaviours of a hyperbranched polycarbosilane
Authors: Piriou Cassandre , Viers Lucas , Lucas Romain , Bouzat Fabien , Laadoua Hatim , Champavier Yves , Foucaud Sylvie , Coelho Cristina , Babonneau Florence 
Published: July 2018

A hyperbranched polymer, a precursor of silicon carbide (SiC), was successfully synthesized using a hydrosilylation reaction with Karstedt's catalyst. This reaction was optimized with the use of a rheometer coupled with an infrared spectrometer. The polymeric precursor was characterized using NMR and Fourier transform infrared spectroscopies, and dynamic rheology. The polymerization reaction was followed in situ by combined rheological and infrared measurements, indicating a gel‐like behaviour for alkene conversions higher than 0.55. Overall second‐order kinetics was determined for the hydrosilylation reaction. Pyrolysis at 1400 °C led to porous materials with β‐SiC and free carbon.
Highly selective adsorption of cadmium ions by water‐dispersible magnetic thioglycolic acid/graphene oxide composites
Authors: Saçmacı Şerife , Saçmacı Mustafa 
Published: July 2018

A new selective and fast procedure based on magnetic dispersive solid‐phase extraction and zeta potential analysis is proposed for the determination of Cd (II) in some food samples. In the developed method, novel magnetic nanoparticles modified with thioglycolic acid were synthesized/characterized and also applied for quantitative determination of trace amounts of Cd (II) in food samples. The prepared nanoparticles were characterized via infrared spectroscopy, electron microscopy and adsorption–desorption experiments. These magnetic nanocomposites carrying Cd (II) could be easily separated from real samples simply by applying an external magnetic field; no filtration or centrifugation was necessary. Several parameters affecting the analytical performance, such as sample pH, amounts of nanocomposite sample, desorption solution volumes and coexisting ions, were investigated in detail. The detection limit of the method was 0.1 μg l−1 while the relative standard deviation was 1.2% for a Cd (II) concentration of 0.5 mg l−1. The proposed method was successfully applied to food sample analysis and standard reference material samples with satisfactory results, and excellent recoveries were obtained in the range 95–99% even when the matrix, such as sea water, was complex.
The enhanced biological activities of three Zn (II) complexes based on different 1,2,4‐triazole fungicides
Authors: Ren Guo‐yu , Li Jie , Wei Xu‐zhan , Zhou Jin‐hua , Yan Biao , Guo Zhao‐qi , Ren Ying‐hui , Sun Xiao‐hong , Ma Hai‐xia 
Published: July 2018

In order to screen effective fungicides, three Zn (II) complexes, [ZnL14 (NO3)2]·2H2O·2EtOH (1), [ZnL24 (NO3)2] (2), and [ZnL34 (DMF)2](NO3)2 (3), (L1 = paclobutrazol, L2 = diniconazole, and L3 = hexaconazole), were synthesized and characterized by elemental analysis, FT‐IR spectroscopy, and single‐crystal XRD. The antifungal activities of these complexes were then evaluated against four selected fungi using the mycelial growth rate method. The resulting data indicate that all the complexes show the enhanced antifungal activities than the corresponding ligand and mixtures. And, the interactions between the metal salt and ligands in the three complexes seem to be synergistic. According to the study of the influence of the structures on the activity, complex 2 with C=C linkage and 2,4‐dichlorophenyl moieties enhances the bioactivity significantly, especially against Wheat gibberellic (II). Density functional theory (DFT) calculations were carried out to help explain the enhanced bioactivity of the Zn (II) complexes. Meanwhile, all complexes are excellent grow‐regulators, especially complex 3. The resulting data show that the complexes based on triazole fungicides have the potential applications in agriculture.
Synthesis, structure and property of diorganotin N‐[(3‐methoxy‐2‐oxyphenyl)methylene]tyrosinates
Authors: Tian Laijin , Han Lu , Yao Yanze , Zheng Xiaoliang , Liu Xijie , Lin Xianjie 
Published: July 2018

Five new diorganotin N‐[(3‐methoxy‐2‐oxyphenyl)methylene] tyrosinates, R2Sn[2‐O‐3‐MeOC6H3CH=NCH (CH2C6H4OH‐4)COO] (R = Me, 1; Et, 2; Bu, 3; Cy, 4; Ph, 5), have been synthesized and characterized by elemental analysis, IR, NMR (1H, 13C and 119Sn) spectra, and the X‐ray single crystal diffraction. In non‐coordinated solvent, complexes 1–5 have penta‐coordinated tin atom. In the solid state, 1–3 are centrosymmetric dimmers in which each tin atom is seven‐coordinated in a distorted pentagonal bipyramid, and 4 displays discrete molecular structure with distorted trigonal bipyramidal geometry, and the tin atom of 5 is hexa‐coordinated and possess the distorted octahedral geometry with a coordinational methanol molecule. The intermolecular O‐H⋅⋅⋅O hydrogen bonds in 1–4 link molecules into the different one‐dimensional supramolecular chain with R22 (30) or R22 (20) macrocycles, and the molecules of 5 are joined into a two‐dimensional supramolecular network containing R44 (24) and R44 (28) two macrocycles. Bioassay results against human tumour cell HeLa indicated that 3‐5 belonged to the efficient cytostatic agents and the activity decreased in the order 4>3>5>2>1. The fluorescence determinations show the complexes may be explored for potential luminescent materials.
Graphene wrapped phthalocyanine: Enhanced oxidative desulfurization for dibenzothiophene in fuel
Authors: Zhang Gai , Liu Bulei , Zhou Hongwei , Yang Yan , Chen Weixing , Zhao Jianshe 
Published: July 2018

Graphene wrapped metal phthalocyanine (MPc/RGO, M = Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+) composites are synthesized by a facile ‘in situ hydrothermal’ method, using graphene oxide, M (CH3COO)2 and phthalic anhydride as the precursors. A biomimetic catalytic system of MPc/RGO and molecular O2 have high activity for ultra‐deep removal of dibenzothiophene (DBT) in model oil containing n‐octane. Compared with pure graphene oxide and MPc, MPc/RGO composites displayed highly enhanced catalytic activity for the oxidation of dibenzothiophene in n‐octane. The conversion ratio of DBT was up to 97.51% after 180 min treatment at 60 °C and atmospheric pressure. The photostability of RGO/MPc composites photocatalystic degradation of dibenzothiophene was investigated. Mechanistic studies revealed that the RGO/MPc − O2· species were the main active intermediate via the π‐π stacking interaction of MPc and RGO. The RGO wrapped phthalocyanine materials offer great potential as active photocatalysts for degradation of thiophene derivatives in fuel.
Non‐Bonding Interactions Enable the Selective Formation of Branched Products in Palladium‐Catalyzed Allylic Substitution Reactions
Authors: Wang Ya‐Ni , Lu Liang‐Qiu , Xiao Wen‐Jing 
Published: July 2018

AbstractPalladium‐catalyzed allylic substitution reactions have become established as an important tool for the construction of carbon−carbon and carbon−heteroatom bonds in modern organic synthesis. However, controlling the regioselectivity of this type of transformation to afford chiral branched products, in addition to controlling the enantioselectivity, is a significant challenge. Excitingly, controlling nonbonding interactions between the substituents on the π‐allyl−palladium intermediate and the nucleophile or palladium catalyst has been shown to be effective in achieving this goal. This Focus Review highlights representative advances in this field, according to the mode of non‐bonding interaction, including hydrogen‐bonding, electrostatic, and coordination interactions.
Diagnosis of Partially Observed Petri Net Based on Analytical Redundancy Relationships
Authors: Chouchane Amira , Khedher Atef , Nasri Othman , Kamoun Anas 
Published: July 2018

AbstractIn this paper, we design an efficient diagnosis technique for partially observed discrete event systems modeled by labeled Petri nets. The fault detection is based on analytical redundancy relationships derived from the nominal model. The decomposition of the Tun‐induced subnet to connected subgraphs allows determining the subgraphs that may contain faults. To appreciate the fault localization, a set of analytical redundancy relationships is etablished for each fault transition based on the fault model. The proposed diagnosis approach is independent of the length of the observed sequence and independent of the number of unobservable transitions. The detected faults with the proposed approach are faults which led to a change in the number of tokens in the net.
Development of a colloidal gold nanoparticle‐based immunochromatographic strip for the one‐step detection of miroestrol and puerarin
Authors: Krittanai Supaluk , Kitisripanya Tharita , Udomsin Orapin , Tanaka Hiroyuki , Sakamoto Seiichi , Juengwatanatrakul Thaweesak , Putalun Waraporn 
Published: July 2018

AbstractPueraria candollei or White Kwao Krua (Leguminosae) is an indigenous plant in Thailand which has long been used in Thai traditional medicine. The tuberous root of this plant is widely used for rejuvenation, particularly in elder women. Among the bioactive compounds in P. candollei, miroestrol and puerarin exhibit estrogenic activity. This study aims to develop an immunochromatographic strip (ICS) with a colloidal gold‐based detection system for the simultaneous detection of miroestrol and puerarin in a one‐step analysis. The developed method is sensitive and specific for the detection of miroestrol and puerarin in raw materials and marketed products. The detection limits of miroestrol and puerarin were 0.15 and 4.5 μg, respectively. In addition, the results from the developed ICS were confirmed with an enzyme‐linked immunosorbent assay and presented a good correlation between these two methods. This is the first report on the development of an ICS that can detect miroestrol and puerarin in one step. The developed ICS provides a simplified method for the detection of miroestrol and puerarin in P. candollei and Pueraria spp.
Evaluating the organizational intention to implement an Environmental Management System: evidence from the Indonesian food and beverage industry
Authors: Salim Hengky K. , Padfield Rory , Yuzir Ali , Mohamad Shaza Eva , Kaida Naoko , Papargyropoulou Effie , Nakamura Shohei 
Published: July 2018

AbstractThe over‐exploitation of natural capital and unsustainable production practices has contributed to increased pollution, biodiversity loss, drought, and deforestation. The food and beverage (F&B) sector is one of the largest contributors to the Indonesian economy but it is also responsible for various environmental impacts. Implementing Environmental Management Systems (EMS) is one way to promote improved sustainable practices within organisations, particularly those within the F&B sector. This research investigates the drivers, barriers and incentives for implementing EMS and their causal relationships. Data were collected from 59 F&B companies in East Java, Indonesia. The results indicate that the implementation of EMS tends to be driven internally in an effort to enhance market competitiveness. There is a need for institutions to exert pressures to develop organizational capability to implement EMS. External barriers are significant impeding factors, while internal barriers do not have a direct link to EMS implementation. The moderating role of technical incentives underlines the need to improve infrastructure and policy to support EMS implementation. Theoretical and practical insights for governments and industries are also discussed.
Trends in incidence and associated risk factors of suicide mortality in patients with non‐small cell lung cancer
Authors: Zhou Huaqiang , Xian Wei , Zhang Yaxiong , Chen Gang , Zhao Shen , Chen Xi , Zhang Zhonghan , Shen Jiayi , Hong Shaodong , Huang Yan , Zhang Li 
Published: July 2018

AbstractLung cancer patients have an increased risk for committing suicide. But no comprehensive study about the suicide issues among non‐small‐cell lung cancer (NSCLC) patients has been published. We aimed to estimate the trend of suicide rate and identify the high‐risk group of NSCLC patients. Patients diagnosed with primary NSCLC were identified from Surveillance, Epidemiology, and End Results (SEER) database (1973‐2013). Suicide mortality rate (SMR) were calculated. Multivariable logistic regression was employed to find out independent risk factors for suicide. Among 495 889 NSCLC patients, 694 (0.14%) of them died from suicide. The suicide mortality rates have significantly decreased (before 1993: 0.21%, 1994‐2003: 0.16%, after 2004: 0.09%, P < .001). Male (OR 6.22, 95% CI: 4.96‐7.98, P < .001), white (OR 3.89, 95% CI: 2.66‐5.97, P < .001), being unmarried (OR 1.43, 95% CI: 1.22‐1.67, P < .001), the elderly (60‐74 vs <60: OR 1.24, 95% CI: 1.03‐1.50, P = .024, >75 vs <60: OR 1.31, 95% CI: 1.05‐1.63, P = .018) were independently associated with higher risk of suicide mortality. Surgery (OR: 1.44, 95% CI: 1.19‐1.73, P < .001) was also relative with higher risk of suicide. Our study observed significant decrease in suicide mortality among NSCLC patients in US over past decades. Older age, male sex, unmarried status, and surgery were risk factors of committing suicide. Clinicians should be aware of these high‐risk groups.