bluuebunny/crossref_metadata_2025_split huggingface dataset:
Humic acid functionalized hyperbranched polytriazine based dispersive solid‐phase extraction for acaricides determination in tea matrix
Authors: Mi Yiduo , Cui Xiaoyan , Jia Chendi , Liu Xinya , Zhang Sanbing , Zhou Wenfeng , Gao Haixiang , Lu Runhua 
Published: October 2019

AbstractHyperbranched polytriazine functionalized with humic acid was prepared and developed as new sorbents for dispersive solid‐phase extraction of three acaricides (clofentezine, fenpyroximate, and pyridaben) in tea samples combined with high‐performance liquid chromatography detection. The sorbents were characterized by scanning electron microscopy, energy dispersive spectroscopy, Zeta‐potential, and Fourier transform infrared spectroscopy. The extraction parameters (extraction time, ionic strength, desorption conditions) were optimized. The adsorption mechanism was evaluated utilizing Fourier transform infrared spectra. Under optimum conditions, satisfactory analytical performances were achieved, which included high precision (1.33–9.62%), low limits of detection (0.19–3.54 µg/L), and wide linear range (2.5–500 µg/L) for the analysis of the acaricides. Moreover, the proposed method proved highly effective for the determination of acaricides in tea samples, with the relative recoveries in the range of 65.20–108.13% and relative standard deviations < 9.87%. The method has great application potential for the detection of acaricides in tea samples.
Association of cyclophilin A level and pulse pressure in predicting recurrence of cerebral infarction
Authors: Chang Chen‐Shu , Kuo Chen‐Ling , Huang Ching‐Shan , Cheng Yu‐Shan , Lin Song‐Shei , Liu Chin‐San 
Published: October 2019

AbstractCyclophilin A (CypA), secreted from vascular smooth muscle cells and inflammatory cells in response to oxidative stress, promotes vascular atherosclerosis and development of carotid stenosis. Increased concentration of plasma CypA in acute cerebral infarction was demonstrated clinically. The primary aim of this study was to investigate the prognostic impact between CypA level and outcome in patients with acute ischemic stroke. Admission serum CypA concentrations were detected in 66 acute cerebral infarction patients and in 52 healthy individuals. Inflammatory biomarkers, including high‐sensitivity C‐reactive protein, adhesion molecules, interleukins, and matrix‐metalloproteases, were also assessed. We also examined the relationship between plasma biomarkers, blood pressure (BP), pulse pressure, the carotid artery velocity, the prognostic assessment with modified Rankin scale, and stroke recurrence. Plasma CypA concentration was higher on the first day of hospitalization in the high BP stroke group than in normal BP stroke group, which was statistically significant, which was observed even in the third month and sixth month follow‐up outpatient periods. For stroke recurrence prediction, there was an important association between the higher (>60) pulse pressure on the seventh day of hospitalization and CypA level on the third month and sixth month follow‐up outpatient periods. Our study revealed higher circulating serum levels of CypA in the hypertensive stroke group than in the non‐hypertensive stroke group. We expect that elevated plasma CypA level and raised pulse pressure during hospitalization to become valuable biomarkers in predicting stroke recurrence in the sixth month assessment of acute cerebral infarction.
Surveillance endoscopy after tracheostomy placement in children: Findings and interventions
Authors: Liu C. Carrie , Soares Jennifer J. , Elder Leslie , Hill Leslee , Abts Matthew , Bonilla‐Velez Juliana , Dahl John P. , Johnson Kaalan E. , Ong Thida , Striegl Amanda M. , Whitlock Kathryn , Parikh Sanjay R. 
Published: October 2019

Objectives/HypothesisThe Seattle Children's Hospital implemented the Trach Safe Initiative to improve airway safety in tracheostomy‐dependent children (TDC). A key tenet of this initiative is surveillance endoscopy. The objectives of this study were to describe the prevalence of abnormal airway changes in TDC, identify risk factors for these changes, and describe the frequency of airway interventions.Study DesignRetrospective case series.MethodsThis is a review of children 0 to 21 years old who underwent tracheostomy and surveillance endoscopy from February 1, 2014 to January 1, 2019. Descriptive statistics were used to report the prevalence of abnormal airway changes and interventions following tracheostomy. Pearson χ2 tests and logistic regression were used to identify risk factors for the development of abnormal changes.ResultsThere were 127 children identified. The median time from tracheostomy to initial surveillance endoscopy was 1.6 months (interquartile range = 1.3–2.4 months). At initial endoscopy, 86.6% of patients had at least one abnormal airway finding. The most common findings were subglottic edema/stenosis (57.3%), glottic edema (37.3%), and suprastomal granulation tissue (31.8%). Prematurity and a history of failed extubations were significantly associated with abnormal findings on endoscopy (odds ratio [OR] = 7.2, P = .01 and OR = 4.1, P = .03, respectively). Of those with abnormal findings, 32.7% underwent an intervention to improve airway patency and safety. The most common interventions performed were suprastomal granuloma excision (44.4%), steroid injection (22.2%), and balloon dilation of the glottis or subglottis (19.4%).ConclusionsThe prevalence of early abnormal airway changes in TDC is high, particularly in young children with a history of prematurity and failed extubation.Level of Evidence4Laryngoscope, 130:1327–1332, 2020
The Making of Infinity Cube, a Bioluminescence Art Exhibit
Authors: Latz Michael I. 
Published: October 2019

AbstractInspired by a midnight stroll on a beach in Mexico, it culminated in an innovative installation at the Birch Aquarium at Scripps Institution of Oceanography. This is the story of a bioluminescence art exhibit called Infinity Cube, which was on display from April 2017 through September 2018.
Putting an end to the Pseudomonas aeruginosa IQS controversy
Authors: Cornelis Pierre 
Published: October 2019

AbstractDespite published evidence that IQS (2‐(2‐hydroxylphenyl)‐thiazole‐4‐carbaldehyde) is in fact aeruginaldehyde, a by‐product of the siderophore pyochelin biosynthesis or degradation and that the ambABCDE genes are not responsible for IQS synthesis, several authors, including in top review journals, perpetuate the wrong information. I hope that this short comment will clarify the situation once and for all.
Development of upper air simulator for the calibration of solar radiation effects on radiosonde temperature sensors
Authors: Lee Sang‐Wook , Yang Inseok , Choi Byung IL , Kim Sunghun , Woo Sang‐Bong , Kang Woong , Oh Youn Kyun , Park Seongchong , Yoo Jae‐Keun , Kim Jong Chul , Lee Young Hee , Kim Yong‐Gyoo 
Published: October 2019

AbstractFor the accurate measurement of temperature in the upper air by using radiosondes, one prerequisite is the compensation of solar radiation effects that cause sensor heating. The development at the Korea Research Institute of Standards and Science (KRISS) of an upper air simulator (UAS) that can simulate radiation effects is reported. The UAS can independently control four environmental parameters: irradiance, temperature, pressure and air speed. An entire radiosonde can be installed in the test chamber and the measurement data transmitted remotely via an antenna. Solar irradiance is mimicked by using a solar simulator that irradiates the radiosonde sensor. The temperature of the test chamber is controlled from −70 to 20°C by placing it inside a climatic chamber. The pressure and ventilation speed in the test chamber are modulated using combinations of sonic nozzles, a mass flow controller and a vacuum pump. A ventilation speed of 5 m·s−1, which mimics the speed of ascent of the radiosondes when lifted using a balloon, is achieved at pressures as low as 7 hPa. The capability of controlling the environmental parameters independently and the stability of each parameter are presented. As a proof of concept, the radiation‐induced bias on the temperature sensor of a commercial radiosonde Vaisala RS41 is measured. The effect of each parameter is investigated by varying it while keeping the other parameters fixed. Radiosonde calibration using the UAS at the KRISS will help improve the traceability of upper air measurements to the International System of Units.
Probabilistic surrogate models for uncertainty analysis: Dimension reduction‐based polynomial chaos expansion
Authors: Son Jeongeun , Du Yuncheng 
Published: October 2019

SummaryThis paper presents an approach for efficient uncertainty analysis (UA) using an intrusive generalized polynomial chaos (gPC) expansion. The key step of the gPC‐based uncertainty quantification (UQ) is the stochastic Galerkin (SG) projection, which can convert a stochastic model into a set of coupled deterministic models. The SG projection generally yields a high‐dimensional integration problem with respect to the number of random variables used to describe the parametric uncertainties in a model. However, when the number of uncertainties is large and when the governing equation of the system is highly nonlinear, the SG approach‐based gPC can be challenging to derive explicit expressions for the gPC coefficients because of the low convergence in the SG projection. To tackle this challenge, we propose to use a bivariate dimension reduction method (BiDRM) in this work to approximate a high‐dimensional integral in SG projection with a few one‐ and two‐dimensional integrations. The efficiency of the proposed method is demonstrated with three different examples, including chemical reactions and cell signaling. As compared to other UA methods, such as the Monte Carlo simulations and nonintrusive stochastic collocation (SC), the proposed method shows its superior performance in terms of computational efficiency and UA accuracy.
A 3D Lagrangian gradient smoothing method framework with an adaptable gradient smoothing domain‐constructing algorithm for simulating large deformation free surface flows
Authors: Mao Zirui , Liu G. R. 
Published: October 2019

SummaryA novel smoothing particle hydrodynamics (SPH)‐like Lagrangian meshfree method, named as Lagrangian gradient smoothing method (L‐GSM), has been proposed to avoid the “tensile instability” issue in SPH simulation by replacing the SPH particle‐summation gradient approximation technique with a local grid‐based GSM gradient smoothing operator. The L‐GSM model has been proven effective and efficient when applied to a wide range of large deformation problems for fluids and flowing solids in two‐dimensional case. In this study, a three‐dimensional (3D) L‐GSM numerical framework is proposed for simulating large deformation problems with the existence of free surfaces through developing a widely adaptable 3D gradient smoothing domain (GSD) constructing algorithm. It includes three key novel ingredients: (i) the localized GSD based on an efficient distance‐oriented particle‐searching algorithm enabling both easy implementation and efficient computation; (ii) a novel algorithm for constructing 3D GSD to guarantee the effectiveness of the 3D GSM gradient operator adaptable to any extreme cases; (iii) a robust normalized 3D GSM gradient operator formulation that can restore the accuracy of gradient approximation even on boundary interface. The effectiveness of the proposed 3D GSD‐constructing algorithm is first verified under various distribution conditions of particles. The accuracy of the proposed adaptable 3D GSM gradient algorithm is then examined through conducting a series of numerical experiments with different spacing ratios. Finally, the 3D L‐GSM numerical framework is applied to solve a practical problem of free surface flows with large deformation: collapse of a soil column. The results reveal that the present adaptable 3D L‐GSM numerical framework can effectively handle the large deformation problems, like flowing solids, with a constantly changing arbitrary free surface profile.
Controllable Delay and Polarization Routing of Single Photons
Authors: Maisch Julian , Vural Hüseyin , Jetter Michael , Michler Peter , Gerhardt Ilja , Portalupi Simone Luca 
Published: October 2019

AbstractFull control of single photons is important in quantum information and quantum networking. In particular, controlling the photon–atom interaction can be an appealing means to realize more complex quantum experiments. As a matter of example, the storage of photons into atomic media represents one key approach to memory‐assisted quantum communication and computing. Here it is shown that the propagation of single photons from a semiconductor quantum dot can be deliberately controlled by an atomic vapor under the application of an external magnetic field. The present results enable the use of an atomic vapor as a precise and reliable wavelength selective delay and allows for routing the single photons according to their polarization and the external magnetic field. With an overall delay of 25 ns, it is possible to fine‐tune the arrival time of the photons by more than 600 ps which matches the scale of the quantum dot's lifetime. The experimental data are fully reproduced by a theoretical model.
3D‐Enhanced, High‐Performing, Super‐hydrophobic and Electromagnetic‐Interference Shielding Fabrics Based on Silver Paint and Their Use in Antibacterial Applications
Authors: Ghosh Sabyasachi , Das Poushali , Ganguly Sayan , Remanan Sanjay , Das Tushar Kanti , Bhattacharyya Swarup Krishna , Baral Joydeep , Das Amit Kumar , Laha Tapas , Das Narayan Ch. 
Published: October 2019

AbstractA unique brush coating technique was adopted to prepare high microwave absorbing super‐hydrophobic bactericidal fabrics. 3D micro‐CT, field emission scanning electron microscopy (FE‐SEM) and high resolution transmission electron microscopy (HR‐TEM) analyses were employed to establish the composite morphology. X‐ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were used to characterize the embedded silver nanoparticles in the cotton fabrics. The developed thin wearable coated fabrics hold the lowest resistivity of 8 ohm‐cm−2 (lighten up series of LEDs) and electromagnetic interference (EMI) shielding effectiveness (SE) of 30.07 dB at 0.3 mm coating thickness within the X‐band frequency range. These thin coated fabrics can be the used in the flexible electronic devices along with extreme bactericidal feature against E. coli.
Byproduct‐Free Synthesis, Characterization, and Reactivity of 1, 2‐Diaminosiloxane Monolayers on Silicon/Silicon Dioxide
Authors: Khadka Kiran , Carpenter George Kenyon , Ferguson Gregory S. 
Published: October 2019

AbstractThe facile self‐assembly of monolayers films derived from N‐(2‐aminoethyl)‐2, 2, 4‐trimethyl‐1‐aza‐2‐silacyclopentane on silicon/silicon dioxide substrates from the solution phase is reported. This adsorbate reacts with silanols at the surface to produce a covalent siloxane linkage to the substrate via ring‐opening and produces no byproduct(s). The resulting diamine surface reacts with maleic anhydride or succinic anhydride to produce the corresponding carboxylic‐acid terminated surfaces. The kinetics of these reactions and their products were characterized by contact‐angle goniometry, optical ellipsometry, and X‐ray photoelectron spectroscopy.
Ultrathin Graphitic Carbon Nitride Nanosheets as Efficient Catalysts for Degradation of Pollutants under Visible Light
Authors: Zhao Qian , Yang Cheng , Liu Ruifeng 
Published: October 2019

AbstractIn this paper, ultrathin g‐C3N4 nanosheets (U‐CNs‐4) were prepared via short time sonication‐assisted exfoliation and solvothermal treatment method in ethylene glycol solvent. It was found that the obtained ultrathin g‐C3N4 nanosheets with a thickness of ranges from 4 to 5 nm, exhibited a higher specific surface area of 35.7 m2/g and larger electronic band structure (by 0.16 eV), enhanced photocurrent response and improved electron transport ability due to the quantum confinement effect. The photocatalytic activities have been proved by photocatalytic degradation Rhodamine B (RhB) and ciprofloxacin (CIP) under visible‐light irradiation. Results show that the U‐CNs‐4 exhibited obviously enhanced photocatalytic activity in comparison with other samples. The degradation efficiency of RhB was 4.4 times higher than that of the bulk g‐C3N4 (B‐CN). The enhanced photocatalytic activity was due to the more active sites, the enhanced oxidation ability and improved electron transport ability, which improving separation efficiency of photogenerated electron‐hole pairs. Finally, the possible for the enhancing photocatalytic mechanism was revealed based on the active species trapping and electron spin resonance (ESR) experiments.
Folic‐Acid‐Functionalized Magnetic Nanoparticles as Green and Magnetic Recyclable Catalyst for the Synthesis of 4‐Aryl‐NH‐1,2,3‐triazoles in a Green Media
Authors: Bagheri Sepideh , Nejad Masoumeh Jadidi , Pazoki Farzane , Miraki Maryam Kazemi , Heydari Akbar 
Published: October 2019

AbstractA useful, robust, and cheap procedure was obtained for the synthesis of 4‐aryl‐NH‐1,2,3‐triazoles via aromatic aldehydes, nitromethane and choline azide in the presence of folic acid immobilized magnetic nanoparticle with good yields. The magnetic catalyst is easily synthesized and can be recycled at least five times with no significant loss in activity. In addition, the choline azide is used as a reagent and green solvent.
Synthesis of Bis‐(2‐thiazolyl)amine Analogues and Evaluation of Their Antibacterial, Antioxidant and Cytotoxic Activities
Authors: Alaraidh Ibrahim A. , Okla Mohammad K. , Alamri Saudi A. , AL‐ghamdi Abdullah A. , Soufan Walid H. , Allam Ahmed A. , Fouda Moustafa M. G. , Gaffer Hatem E. 
Published: October 2019

AbstractAn effective and economical preparation of bis‐(2‐thiazolyl)amine analogues was achieved by the reaction of 3‐(5‐arylazothiazol‐2‐yl)thioureas with various halogenated carbonyl reagents (namely; chloroacetic acid, diethyl bromomalonate, chloroacetone and phenacyl bromide). The physical and spectral analyses were performed to demonstrate the correct configurations of all incorporated analogues. It is clear that most of synthesized bis‐(2‐thiazolyl)amine derivatives revealed good biological efficacy, including anticancer, antibacterial and antioxidant. The synthesized bis‐(2‐thiazolyl)amine derivatives were investigated as cytotoxic agents against four different cell lines, in which the results revealed potent efficacies of the synthesized derivatives relative to the results of antibiotic standards. In addition, the antioxidant efficacy of all analogues was determined using ABTS•+ “2,2′‐azino‐bis(3‐ethylbenzothiazoline‐6‐sulphonic acid” method.
Thermal Conversion Behavior of Medium–Low–Temperature Coal Tar Pitch During Liquid–Phase Carbonization Process
Authors: Zhu Yaming , Hu Chaoshuai , Zhao Chunlei , Xu Yunliang , Gao Lijuan , Zhao Xuefei 
Published: October 2019

AbstractMedium–low temperature coal tar pitch (MLP) is a type of aromatic carbonaceous material obtained by the low temperature distillation of low rank coal, and is considered as a desirable raw material for the production of artificial carbon/graphite material. The thermal conversion behaviors of MLP during the liquid‐phase carbonization process were analyzed in detail in this study. Further, the changes of molecular structure and carbon microcrystalline structure of MLP and liquid‐phase carbonization products derived from it were quantitatively investigated by optical microscopy, fourier transform infrared spectroscopy, Raman spectroscopy, X‐ray diffraction, and curve‐fitting method. Results showed that both branched chain and the contents of C=O functional groups in the MLP played a key role in the reaction reactivity. Moreover, temperature of 450 °C was found to be a rapid changing temperature point on the enhancement of thermal conversion of MLP. The stacking height (Lc), parallel layers (N), average number of aromatic rings in each layer (n), ratio of ‘impurity’ structure (RI), ratio of amorphous carbon structure (RAC), ratio of graphite carbon structure (RGC), and ratio of defects graphite carbon structure (RDGC) exhibited a significant change with the improvement of liquid‐phase carbonization temperature.
Preparation of DABCO‐Based Acidic‐Ionic‐Liquid‐Supported ZnO Nanoparticles and Their Application for Ecofriendly Synthesis of N‐Aryl Polyhydroquinoline Derivatives
Authors: Mondal Priya , Chatterjee Sauvik , Sarkar Piyali , Bhaumik Asim , Mukhopadhyay Chhanda 
Published: October 2019

AbstractHere we have reported a new significant DABCO based acidic ionic liquid ([DABCO(C2COOH)2]2+[Br−]2). With the assistance of this IL, ZnO nanoparticle (NP) supported [DABCO (C2COOH)2]2+[Br−]2 immobilised ZnO‐[DABCO(C2COOH)2]2+[Br−]2 was established, a new supported Catalyst with an ionic liquid layer (SCILL,). Since ZnO nanoparticles are amphoteric in nature and DABCO based ionic liquid is acidic in nature, it posses both acidic and basic catalytic site in a single moiety. With the assistance of this quasi heterogeneous, efficient, recyclable catalyst we were able to produce series of N‐aryl hexahydroquinolines in aqueous medium with good to excellent yield within shorter reaction time. This catalyst was characterised by Scanning Electron Microscope (SEM), High Resolution Transmission Electron Microscope (HRTEM), Energy Dispersive Analysis X‐ray (EDAX), Dynamic Light Scattering Spectroscopy (DLS), Powder X‐Ray Diffraction (PXRD), Thermo Gravimetric Analysis (TGA) and Fourier Transform Infrared spectroscopy (FT‐IR). Here, synergetic catalytic effect of amphoteric heterogeneous zinc oxide nanoparticles and acidic homogeneous DABCO based ionic liquid were commendably compiled.
Cadmium(II)‐Loaded Fe3O4@MPTS Nanoparticles: Preparation and Application as Catalyst for C‐N Coupling Reactions
Authors: Rathod Prakash B. , Chappa Sankararao , Kumar K. S. Ajish , Pandey Ashok K. , Athawale Anjali A. 
Published: October 2019

AbstractSurface of Fe3O4 nanoparticles (NPs) was coated with (3‐mercaptopropyl)trimethoxysilane (MPTS) to form Fe3O4@MPTS NPs. Thus formed Fe3O4@MPTS NPs were studied for preconcentration of the representative Cd(II), Pb(II), and As(III) ions, and loading capacities toward these ions were found to be 17(±0.7), 29(±0.3), and 13(±0.5) mg g−1, respectively. As an example of safe utilization of toxic metal ions strongly bonded on magnetically retrievable NPs for catalytic applications, the Cd(II) loaded Fe3O4@MPTS NPs were successfully utilized for conducting the C−N bond formation reaction in comparable yields with that were reported in the literature but exhibited higher turnover number and turnover frequency.
Gold‐Catalyzed Reaction of 2H‐Tetrazoles with Alkynes: Efficient Route to N‐Alkenylated Tetrazoles
Authors: Cao Ziping , Zhao Changyin , Zhu Jiekun , Yan Shikun , Tian Laijin , Sun Xuejun , Meng Xin 
Published: October 2019

AbstractA gold‐catalyzed reaction of 2H‐tetrazoles with alkynes was described for the efficient synthesis of a variety of N‐alkenylated tetrazole derivatives, including N‐1 and N‐2 vinyl functionalized products which are readily isolated by column chromatography. The reaction mechanism was proposed to be a nucleophilic addition process to the alkyne motif activated by gold catalyst. The reaction features mild reaction condition, simple operation and high yields.