bluuebunny/crossref_metadata_2025_split huggingface dataset:
Improved gas transport properties of polyurethane–urea membranes through incorporating a cadmium‐based metal organic framework
Authors: Sadeghi Morteza , Isfahani Ali Pournaghshband , Shamsabadi Ahmad Arabi , Favakeh Sahar , Soroush Masoud 
Published: November 2019

ABSTRACTThe increasing need for more efficient separation processes has motivated the development of polymer membranes that can provide fast and selective transport. In this work, cadmium‐based metal–organic framework (MOF) nanoparticles and a polyurethane–urea (PUU) elastomer were synthesized. New mixed‐matrix membranes (MMMs) were then fabricated from the nanoparticles and the PUU. SEM images verified that embedding the nanoparticles changes the morphology of the PUU and the nanoparticles disperse well in the PUU due to satisfactory compatibility of the polymer and nanoparticles. Fourier transform infrared spectroscopy and X‐ray diffraction analysis confirmed the dispersion of the nanoparticles in the soft segment of the PUU. With increased temperature, gas permeabilities of the MMMs improved but their sieving ability deteriorated. An MMM incorporating 2.5 wt % of the MOF showed a CO2permeability of ~140 barrer and a CO2/N2selectivity of ~30, which are 89 and 38% higher than those of the pristine membrane. Gas permeation tests showed that the higher CO2/N2selectivity of the MMMs was due to improved solubility selectivity and the higher CO2permeability was a result of improved CO2diffusivity and solubility coefficients. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2019,137, 48704.
A comparison of the beta‐geometric model with landmarking for dynamic prediction of time to pregnancy
Authors: van Eekelen Rik , Putter Hein , McLernon David J. , Eijkemans Marinus J. , van Geloven Nan 
Published: November 2019

AbstractWe conducted a simulation study to compare two methods that have been recently used in clinical literature for the dynamic prediction of time to pregnancy. The first is landmarking, a semi‐parametric method where predictions are updated as time progresses using the patient subset still at risk at that time point. The second is the beta‐geometric model that updates predictions over time from a parametric model estimated on all data and is specific to applications with a discrete time to event outcome. The beta‐geometric model introduces unobserved heterogeneity by modelling the chance of an event per discrete time unit according to a beta distribution. Due to selection of patients with lower chances as time progresses, the predicted probability of an event decreases over time. Both methods were recently used to develop models predicting the chance to conceive naturally. The advantages, disadvantages and accuracy of these two methods are unknown. We simulated time‐to‐pregnancy data according to different scenarios. We then compared the two methods by the following out‐of‐sample metrics: bias and root mean squared error in the average prediction, root mean squared error in individual predictions, Brier score and c statistic. We consider different scenarios including data‐generating mechanisms for which the models are misspecified. We applied the two methods on a clinical dataset comprising 4999 couples. Finally, we discuss the pros and cons of the two methods based on our results and present recommendations for use of either of the methods in different settings and (effective) sample sizes.
Study of thermoluminescence in turtle shell fossils using radiation dosimetry
Authors: Ovhal Digambar A. , Samant Bandana , Dhoble N.S. , Mohabey D.M. , Dhoble S.J. 
Published: November 2019

AbstractThe present study describes for the first time thermoluminescence (TL) characterization of turtle shell. A fossil shell was collected from the Dongargaon area in the Chandrapur district of Maharashtra, India. TL was recorded and a comparative study of TL for the above material was performed to understand the special TL characteristics of the shell. The shell was irradiated with 60Co γ‐radiation to study its TL properties. The sample displayed two good TL peaks at 135°C and 255°C. A linear dose–response curve for the irradiated sample was produced for the dose range 0.79–28.5 kGy; this sample of turtle shell (fossil) may be useful as a high dose dosimetry phosphor in this range. This geological sample was further characterized using X‐ray diffraction to confirm its phase structure and by scanning electron microscopy , Fourier transform infrared and wavelength dispersive X‐ray fluorescence spectroscopy to determine morphology, vibration, and elemental composition as ppm or percentage of the sample, respectively. Kinetic parameters of the TL glow peak were calculated using three different methods.
Does corporate environmental responsibility engagement affect firm value? The mediating role of corporate innovation
Authors: Li Zhenghui , Liao Gaoke , Albitar Khaldoon 
Published: November 2019

AbstractThis paper aims to construct a comprehensive corporate environmental responsibility (CER) engagement measurement to examine the relationship between CER engagement and firm value as well as explore the mediating effect of corporate innovation on this relationship based on a sample of 496 China's A‐share listed companies from 2008 to 2016. The results show that when firms start to adopt environmental regulations, CER would have a negative effect on firm value; however, at a specific level, CER would start to enhance firm value positively. In addition to this, corporate innovation plays a mediating role in the relationship between CER and firm value. Corporate innovation promotes firm value of firms with CER more than firms without CER. Overall, the findings of this paper are extremely relevant for the government, investors, and firm's managers and can be utilized for policy and investment decision making. Also, the findings encourage firms to enhance their sense of environmental responsibility in order to enhance their competitive advantages, enhance corporate innovation capabilities, and thus enhance firm value.
Heartech: Another parachute looking for a landing zone in interventions for heart failure
Authors: Kawabori Masashi , Kapur Navin K. 
Published: November 2019

Key Points
Maladaptive left ventricular remodeling after acute myocardial infarction is defined by increased left ventricular dimensions and is associated with poor clinical outcomes.
Left ventricular partitioning devices mechanically reduce left ventricular dimensions and are postulated to improve symptomatic heart failure.
In this first in human study, deployment of the Heartech LVPD was shown to be feasible without a prohibitive safety signal precluding future pivotal trials.
Gradually closing the loop
Authors: Jerud Elliot S. , Gray William A. 
Published: November 2019

Key Points
The Lariat device is an epicardial nonimplant suture delivery device capable of left atrial appendage closure.
The current study offers promising results but is limited by small sample size and multiple foundational issues with study design.
aMaze, a large multi‐center prospective randomized trial is currently underway and will provide additional insight into the safety of this device and its efficacy in maintenance of sinus rhythm after atrial fibrillation ablation.
Applying sinus node function testing to evaluate perioperative management for patients suffering from tachycardia‐bradycardia syndrome before atrial fibrillation ablation
Authors: Han Dan , She Jianqing , Sun Chaofeng , Li Hongbing 
Published: November 2019

AbstractSinus node (SN) function is an important prognostic factor of atrial fibrillation (AF). However, AF ablation guideline has not recommended SN function test before ablation. SN function testing before AF ablation in patients with tachycardia‐bradycardia syndrome should be beneficial to determine further therapy strategies and prognosis.
Flexible Methane Production Using a Proportional Integral Controller with Simulation‐Based Soft Sensor
Authors: Raeyatdoost Niloofar , Eccleston Robin , Wolf Christian 
Published: November 2019

AbstractAnaerobic digestion plants have the potential to produce biogas on demand to help balance renewable energy production and energy demand by consumers. A proportional integral (PI) controller is constructed and tuned with a novel tuning method to control biogas production in an optimal manner. In this approach, the proportional part of the controller is a function of the feeding rate and system's degree of stability. To estimate the degree of stability, a simulation‐based soft sensor is developed. By means of the PI controller, the requirement for gas storage capacity of the digester is reduced by approximately 30 % compared to a constant, continuous feeding regime of the digester.
Electrochemical Reduction of CO2: Effect of Convective CO2 Supply in Gas Diffusion Electrodes
Authors: Duarte Miguel , De Mot Bert , Hereijgers Jonas , Breugelmans Tom 
Published: November 2019

AbstractThe electrochemical reduction of carbon dioxide (CO2) is a promising technology in light of energy transition and industrial electrification. In this study, two different electrolyzer configurations, flow‐through and flow‐by modes, were analyzed for the production of carbon monoxide to resolve the CO2 mass‐transfer limitation problem at high current densities in gas diffusion electrodes. These two configurations respectively state convective and diffusive flow inside the gas diffusion layer, and their effect was studied on the cathodic performance of the electrolyzer by varying the operating conditions: cathodic potential, electrocatalyst loading, and Nafion content. In flow‐through configuration, a current density of 220 mA/cm2 could be achieved at a faradaic efficiency of 90 %; whereas, in the flow‐by configuration, the current density was at the same faradaic efficiency limited to 140 mA/cm2. However, the flow‐through configuration has a few limitations, such as lower energy efficiency, owing to the higher ohmic drop and the faster deactivation caused by crystallization of electrolyte salts inside the gas diffusion electrode. Therefore, flow‐by mode is currently the most adequate configuration for the long‐term operation of electrolyzers for the reduction of CO2 to CO. This study represents an essential step toward the application of electrolyzers for the electroreduction of CO2.
Electrochemical Behavior of Cytochrome C Immobilized in a Magnetically Induced Mesoporous Framework
Authors: Melo Antonio F. A. A. , Sedenho Graziela C. , Osica Izabela , Ariga Katsuhiko , Crespilho Frank N. 
Published: November 2019

AbstractInvited for this month's cover picture is Prof. Crespilho's group (Bioelectrochemistry and Interfaces) from São Carlos Institute of Chemistry (IQSC/USP, Brazil). The cover picture shows molecules of redox protein cytochrome c immobilized on the metallic coating from magnetite nanoparticles decorated with near‐monodisperse gold nanoparticles, which are used as colloidal building blocks for the magnetic assembly of mesoporous framework. Read the full text of the Article at 10.1002/celc.201901047.
On Silylated Oxonium and Sulfonium Ions and Their Interaction with Weakly Coordinating Borate Anions
Authors: Bläsing Kevin , Labbow Rene , Michalik Dirk , Reiß Fabian , Schulz Axel , Villinger Alexander , Walker Svenja 
Published: November 2019

AbstractAttempts have been made to prepare salts with the labile tris(trimethylsilyl)chalconium ions, [(Me3Si)3E]+ (E=O, S), by reacting [Me3Si‐H‐SiMe3][B(C6F5)4] and Me3Si[CB] (CB−=carborate=[CHB11H5Cl6]−, [CHB11Cl11]−) with Me3Si‐E‐SiMe3. In the reaction of Me3Si‐O‐SiMe3 with [Me3Si‐H‐SiMe3][B(C6F5)4], a ligand exchange was observed in the [Me3Si‐H‐SiMe3]+ cation leading to the surprising formation of the persilylated [(Me3Si)2(Me2(H)Si)O]+ oxonium ion in a formal [Me2(H)Si]+ instead of the desired [Me3Si]+ transfer reaction. In contrast, the expected homoleptic persilylated [(Me3Si)3S]+ ion was formed and isolated as [B(C6F5)4]− and [CB]− salt, when Me3Si‐S‐SiMe3 was treated with either [Me3Si‐H‐SiMe3][B(C6F5)4] or Me3Si[CB]. However, the addition of Me3Si[CB] to Me3Si‐O‐SiMe3 unexpectedly led to the release of Me4Si with simultaneous formation of a cyclic dioxonium dication of the type [Me3Si‐μO‐SiMe2]2[CB]2 in an anion‐mediated reaction. DFT studies on structure, bonding and thermodynamics of the [(Me3Si)3E]+ and [(Me3Si)2(Me2(H)Si)E]+ ion formation are presented as well as mechanistic investigations on the template‐driven transformation of the [(Me3Si)3E]+ ion into a cyclic dichalconium dication [Me3Si‐μE‐SiMe2]22+.
Shedding Light on the Interactions of Hydrocarbon Ester Substituents upon Formation of Dimeric Titanium(IV) Triscatecholates in DMSO Solution
Authors: Kwamen A. Carel N. , Schlottmann Marcel , Van Craen David , Isaak Elisabeth , Baums Julia , Shen Li , Massomi Ali , Räuber Christoph , Joseph Benjamin P. , Raabe Gerhard , Göb Christian , Oppel Iris M. , Puttreddy Rakesh , Ward Jas S. , Rissanen Kari , Fröhlich Roland , Albrecht Markus 
Published: November 2019

AbstractThe dissociation of hierarchically formed dimeric triple lithium bridged triscatecholate titanium(IV) helicates with hydrocarbyl esters as side groups is systematically investigated in DMSO. Primary alkyl, alkenyl, alkynyl as well as benzyl esters are studied in order to minimize steric effects close to the helicate core. The 1H NMR dimerization constants for the monomer–dimer equilibrium show some solvent dependent influence of the side chains on the dimer stability. In the dimer, the ability of the hydrocarbyl ester groups to aggregate minimizes their contacts with the solvent molecules. Due to this, most solvophobic alkyl groups show the highest dimerization tendency followed by alkenyls, alkynyls and finally benzyls. Furthermore, trends within the different groups of compounds can be observed. For example, the dimer is destabilized by internal double or triple bonds due to π–π repulsion. A strong indication for solvent supported London dispersion interaction between the ester side groups is found by observation of an even/odd alternation of dimerization constants within the series of n‐alkyls, n‐Ω‐alkenyls or n‐Ω‐alkynyls. This corresponds to the interaction of the parent hydrocarbons, as documented by an even/odd melting point alternation.
In Situ Generation of Ruthenium Carbonyl Phosphine Complexes as a Versatile Method for the Development of Enantioselective C−O Bond Arylation
Authors: Kondo Hikaru , Kochi Takuya , Kakiuchi Fumitoshi 
Published: November 2019

AbstractWe report here a method for in situ generation of various ruthenium carbonyl phosphine catalysts for arylation via cleavage of inert aromatic carbon–oxygen bonds. The use of catalyst systems consisting of [RuCl2(CO)(p‐cymene)], CsF, styrene, and phosphines enabled facile screening of phosphine ligands. Asymmetric C–O arylation was also achieved for atropo‐enantioselective biaryl synthesis using a chiral monodentate phosphine ligand.
Cycloaddition Reactions of an Active Cyclic Phosphane/Borane Pair with Alkenes, Alkynes, and Carbon Dioxide
Authors: Jie Xiaoming , Sun Qiu , Daniliuc Constantin G. , Knitsch Robert , Hansen Michael Ryan , Eckert Hellmut , Kehr Gerald , Erker Gerhard 
Published: November 2019

AbstractThe active six‐membered cyclo‐FLP6undergoes a rapid P/B addition reaction to carbon dioxide. At elevated temperature, the resulting heterobicyclo[2.2.2]octane derived product 7undergoes ring opening and equilibrates with the cyclotetramer(7)4. In the large macrocyclic structure, four monomeric six‐membered cyclo‐FLP units are connected by four CO2molecules to form the supramolecular ring system. The P/B cyclo‐FLP6undergoes a variety of additional cycloaddition reactions.
Some concerns regarding the CAT16 chromatic adaptation transform
Authors: Smet Kevin A. G. , Ma Shining 
Published: November 2019

AbstractIn recent literature, a new chromatic adaptation transform, CAT16, has been published to improve upon the widely used CAT02 model. The CAT16 model is based on the form of the CAT02 transform adopted in CIECAM02, but uses a slightly different sensor space to fix some gamut problems plaguing CIECAM02 and adopts a two‐step CAT to ensure symmetry and transitivity. CAT16 is included in CAM16 but is also being promoted as a stand‐alone CAT, one that can be used outside of the CAM16 model. However, the use of CAT16 as a stand‐alone model can cause inconsistencies in the calculated corresponding colors due to the presence of the relative luminance of the adapting white (Yw) in the von Kries‐Ives gain control factors. Such inconsistencies are not present for the stand‐alone version of the CAT02 model, which, unlike the version adopted in CIECAM02, does not include the Yw factors. CAT16 should therefore be modified by omitting the Yw factors. In this article, we will briefly discuss these issues in more detail and provide a consistent two‐step CAT adopting the CAT16 sensor space.
Theoretical Justification and Error Analysis for Slender Body Theory
Authors: Mori Yoichiro , Ohm Laurel , Spirn Daniel 
Published: November 2019

AbstractSlender body theory facilitates computational simulations of thin fibers immersed in a viscous fluid by approximating each fiber using only the geometry of the fiber centerline curve and the line force density along it. However, it has been unclear how well slender body theory actually approximates Stokes flow about a thin but truly three‐dimensional fiber, in part due to the fact that simply prescribing data along a 1D curve does not result in a well‐posed boundary value problem for the Stokes equations in ℝ3. Here, we introduce a PDE problem to which slender body theory (SBT) provides an approximation, thereby placing SBT on firm theoretical footing. The slender body PDE is a new type of boundary value problem for Stokes flow where partial Dirichlet and partial Neumann conditions are specified everywhere along the fiber surface. Given only a 1D force density along a closed fiber, we show that the flow field exterior to the thin fiber is uniquely determined by imposing a fiber integrity condition: the surface velocity field on the fiber must be constant along cross sections orthogonal to the fiber centerline. Furthermore, a careful estimation of the residual, together with stability estimates provided by the PDE well‐posedness framework, allows us to establish error estimates between the slender body approximation and the exact solution to the above problem. The error is bounded by an expression proportional to the fiber radius (up to logarithmic corrections) under mild regularity assumptions on the 1D force density and fiber centerline geometry. © 2019 Wiley Periodicals, Inc.
Reversible Photoswitching of Isolated Ionic Hemiindigos with Visible Light
Authors: Carrascosa Eduardo , Petermayer Christian , Scholz Michael S. , Bull James N. , Dube Henry , Bieske Evan J. 
Published: November 2019

AbstractIndigoid chromophores have emerged as versatile molecular photoswitches, offering efficient reversible photoisomerization upon exposure to visible light. Here we report synthesis of a new class of permanently charged hemiindigos (HIs) and characterization of photochemical properties in gas phase and solution. Gas‐phase studies, which involve exposing mobility‐selected ions in a tandem ion mobility mass spectrometer to tunable wavelength laser radiation, demonstrate that the isolated HI ions are photochromic and can be reversibly photoswitched between Z and E isomers. The Z and E isomers have distinct photoisomerization response spectra with maxima separated by 40–80 nm, consistent with theoretical predictions for their absorption spectra. Solvation of the HI molecules in acetonitrile displaces the absorption bands to lower energy. Together, gas‐phase action spectroscopy and solution NMR and UV/Vis absorption spectroscopy represent a powerful approach for studying the intrinsic photochemical properties of HI molecular switches.
Electrospun Cu‐Deposited Flexible Fibers as an Efficient Oxygen Evolution Reaction Electrocatalyst
Authors: Morinaga Asuka , Tsutsumi Hiromori , Katayama Yu 
Published: November 2019

AbstractThe front cover artwork is provided by the groups of Prof. Yu Katayama and Prof. Hiromori Tsutsumi at the Yamaguchi University, Japan. The image shows the unique microstructures of electrospun flexible fibers, coated with copper, designed as an efficient oxygen evolution reaction (OER) electrocatalyst. Read the full text of the Article at 10.1002/cphc.201900663.
Automated Data Cleanup for Mass Cytometry
Authors: Bagwell Charles Bruce , Inokuma Margaret , Hunsberger Benjamin , Herbert Donald , Bray Christopher , Hill Beth , Stelzer Gregory , Li Stephen , Kollipara Avinash , Ornatsky Olga , Baranov Vladimir 
Published: November 2019

AbstractMass cytometry is an emerging technology capable of 40 or more correlated measurements on a single cell. The complexity and volume of data generated by this platform have accelerated the creation of novel methods for high‐dimensional data analysis and visualization. A key step in any high‐level data analysis is the removal of unwanted events, a process often referred to as data cleanup. Data cleanup as applied to mass cytometry typically focuses on elimination of dead cells, debris, normalization beads, true aggregates, and coincident ion clouds from raw data. We describe a probability state modeling (PSM) method that automatically identifies and removes these elements, resulting in FCS files that contain mostly live and intact events. This approach not only leverages QC measurements such as DNA, live/dead, and event length but also four additional pulse‐processing parameters that are available on Fluidigm Helios™ and CyTOF® (Fluidigm, Markham, Canada) 2 instruments with software versions of 6.3 or higher. These extra Gaussian‐derived parameters are valuable for detecting well‐formed pulses and eliminating coincident positive ion clouds. The automated nature of this new routine avoids the subjectivity of other gating methods and results in unbiased elimination of unwanted events. © 2019 International Society for Advancement of Cytometry
Cross‐layer perspective for channel assignment in cognitive radio networks: A survey
Authors: Gupta Nitin , Dhurandher Sanjay Kumar 
Published: November 2019

SummaryWith the advent of various emerging wireless products, the usage of limited spectrum has grown exponentially in the recent years. In the next few years, that mobile data traffic globally is expected to grow up to 50 EB/month, which is nearly a five times increase over year 2018. Therefore, it will become extremely difficult to satisfy the ever increasing demand through the current fixed spectrum assignment policy in which spectrum band is exclusively used for the particular applications, and it has also led to underutilization of a significant portion of the spectrum (like TV bands). Cognitive radio networks has emerged as a possible solution for the problem which makes dynamic spectrum access possible for unlicensed user when licensed user is not active. Among various operations of cognitive radio, channel assignment to the unlicensed user is very important. Further, wireless regional area network is one of the most important application of cognitive radio, which provides wireless broadband to the rural area using vacant TV channels. This paper discusses channel assignment techniques considering various functionalities for cognitive radio networks in respect of wireless regional area network in the existing literature. Initially, a comprehensive introduction to both cognitive radio networks and wireless regional area networks is provided, and in the end, the paper summarizes the various issues and research challenges in the channel assignment for wireless regional area networks.