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https://www.readbyqxmd.com/read/28521161/visible-light-photo-fenton-oxidation-of-phenol-with-rgo-%C3%AE-feooh-supported-on-al-doped-mesoporous-silica-mcm-41-at-neutral-ph-performance-and-optimization-of-the-catalyst
#1
Ying Wang, Mingxing Liang, Jiasheng Fang, Jun Fu, Xiaochun Chen
In this study, α-FeOOH on reduced graphene oxide (rGO-α-FeOOH) supported on an Al-doped MCM-41 catalyst (RFAM) was optimized for the visible-light photo-Fenton oxidation of phenol at neutral pH. The stability of the catalysts, effect of bubbling aeration, and degradation intermediates were investigated. Results indicated that RFAM with a large Brunauer-Emmett-Teller (BET) area and mesoporous structure displayed excellent catalytic activity for the visible-light-driven (VLD) photo-Fenton process. Phenol degradation was well described by a pseudo-first-order reaction kinetics model...
May 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28516245/municipal-solid-waste-derived-biochar-for-the-removal-of-benzene-from-landfill-leachate
#2
Yohan Jayawardhana, S S Mayakaduwa, Prasanna Kumarathilaka, Sewwandi Gamage, Meththika Vithanage
The potential of biochar, produced from fibrous organic fractions of municipal solid waste (MSW), for remediation of benzene, one of the frequently found toxic volatile organic compounds in landfill leachate, was investigated in this study based on various environmental conditions such as varying pH, benzene concentration, temperature and time. At the same time, landfill leachate quality parameters were assessed at two different dump sites in Sri Lanka: Gohagoda and Kurunegala. MSW biochar (MSW-BC) was produced by slow temperature pyrolysis at 450 °C, and the physiochemical characteristics of the MSW-BC were characterized...
May 17, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28514150/correction-to-photocycle-of-photoactive-yellow-protein-in-cell-mimetic-environments-molecular-volume-changes-and-kinetics
#3
Cheolhee Yang, Seong Ok Kim, Yonggwan Kim, So Ri Yun, Jungkweon Choi, Hyotcherl Ihee
No abstract text is available yet for this article.
May 17, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28512680/a-novel-idea-to-improve-cardiac-output-of-mechanical-circulatory-support-devices-by-optimizing-kinetic-energy-transfer-available-in-forward-moving-aortic-blood-flow
#4
Muhammad B Qureshi, Jacob Glower, Daniel L Ewert, Steven C Koenig
Mechanical circulatory support devices (MCSDs) have gained widespread clinical acceptance as an effective heart failure (HF) therapy. The concept of harnessing the kinetic energy (KE) available in the forward aortic flow (AOF) is proposed as a novel control strategy to further increase the cardiac output (CO) provided by MCSDs. A complete mathematical development of the proposed theory and its application to an example MCSDs (two-segment extra-aortic cuff) are presented. To achieve improved device performance and physiologic benefit, the example MCSD timing is regulated to maximize the forward AOF KE and minimize retrograde flow...
May 16, 2017: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/28511589/a-semi-automatic-method-for-the-extraction-of-the-portal-venous-input-function-in-quantitative-dynamic-contrast-enhanced-ct-of-the-liver
#5
Andrew B Gill, Nicholas J Hilliard, Simon T Hilliard, Martin Graves, David J Lomas, Ashley Shaw
OBJECTIVES: To aid the extraction of the portal venous input function (PVIF) from axial dynamic contrast-enhanced CT images of the liver, eliminating the need for full manual outlining of the vessel across time-points. METHODS: A cohort of 20 patients undergoing perfusion CT imaging of the liver were examined. Dynamic images of the liver were reformatted into contiguous thin slices. A region of interest (ROI) was defined within a transverse section of the portal vein on a single contrast-enhanced image...
May 16, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28505826/steepest-entropy-ascent-nonequilibrium-quantum-thermodynamic-framework-to-model-chemical-reaction-rates-at-an-atomistic-level
#6
G P Beretta, Omar Al-Abbasi, M R von Spakovsky
The steepest entropy ascent (SEA) dynamical principle provides a general framework for modeling the dynamics of nonequilibrium (NE) phenomena at any level of description, including the atomistic one. It has recently been shown to provide a precise implementation and meaning to the maximum entropy production principle and to encompass many well-established theories of nonequilibrium thermodynamics into a single unifying geometrical framework. Its original formulation in the framework of quantum thermodynamics (QT) assumes the simplest and most natural Fisher-Rao metric to geometrize from a dynamical standpoint the manifold of density operators, which represent the thermodynamic NE states of the system...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28504644/direct-reconstruction-of-parametric-images-for-brain-pet-with-event-by-event-motion-correction-evaluation-in-two-tracers-across-count-levels
#7
Mary Germino, Jean-Dominique Gallezot, Jianhua Yan, Richard Carson
Parametric images for dynamic positron emission tomography (PET) are typically generated by an indirect method, i.e., reconstructing a time series of emission images, then fitting a kinetic model to each voxel time activity curve. Alternatively, "direct reconstruction," incorporates the kinetic model into the reconstruction algorithm itself, directly producing parametric images from projection data. Direct reconstruction has been shown to achieve parametric images with lower standard error than the indirect method...
May 15, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28504292/microstructure-degradation-of-ni-cgo-anodes-for-solid-oxide-fuel-cells-after-long-operation-time-using-3d-reconstructions-by-fib-tomography
#8
Atef Zekri, Martin Knipper, Jürgen Parisi, Thorsten Plaggenborg
Solid oxide fuel cells (SOFCs) are electrochemical conversion devices, which essentially consist of two porous electrodes separated by a dense, oxide ion conducting electrolyte. The performance and the durability of SOFCs strongly depend on the electrode microstructure. In this paper, the impact of a relatively long exposure time (up to 20 000 h) under realistic operation terms (temperature (T) = 850 °C, current density (J) = 190-250 mA cm(-2)) in the kinetics of microstructural degradation are investigated for porous nickel (Ni)/ceria gadolinium oxide (CGO) anodes, to understand the microstructural evolution in SOFC cermet anodes...
May 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28503770/disposition-of-levetiracetam-in-healthy-adult-horses
#9
F B Cesar, A J Stewart, D M Boothe, W R Ravis, S H Duran, A A Wooldridge
Nine horses received 20 mg/kg of intravenous (LEVIV ); 30 mg/kg of intragastric, crushed immediate release (LEVCIR ); and 30 mg/kg of intragastric, crushed extended release (LEVCER ) levetiracetam, in a three-way randomized crossover design. Crushed tablets were dissolved in water and administered by nasogastric tube. Serum samples were collected over 48 hr, and levetiracetam concentrations were determined by immunoassay. Mean ± SD peak concentrations for LEVCIR and LEVCER were 50.72 ± 10.60 and 53...
May 15, 2017: Journal of Veterinary Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28499266/model-based-optimization-of-parameters-for-degradation-reaction-of-an-organophosphorus-pesticide-paraoxon-using-ceo2-nanoparticles-in-water-media
#10
Alicia Salerno, Isabelle Pitault, Thierry Devers, Jocelyne Pelletier, Stéphanie Briançon
Degradation and body surface decontamination is vital to prevent the skin penetration of paraoxon (POX), an organophosphorus pesticide, and victims poisoning. CeO2 demonstrated a good efficacy for the degradation of POX. The aim of the study was to develop a model which includes the impact of weight of CeO2, POX and diluent volumes on the degradation kinetics. The modelling was realized with rapid and simple experiments carried out in tubes, in aqueous diluent which contained ions in order to be in accordance with in vitro skin decontamination conditions...
May 1, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28498227/mechanisms-and-treatments-for-shoulder-injuries-in-overhead-throwing-athletes
#11
Jason L Zaremski, Joseph G Wasser, Heather K Vincent
Shoulder injuries in overhead throwing athletes are very common. Throwing volume and mechanical forces that are placed on the glenohumeral joint and associated soft tissue structures are contributors. Poor biomechanics and weak links in the kinetic chain place this athletic population at increased risk for shoulder injuries. Common biomechanical deficiencies in overhead throwing athletes typically involve poor sequential timing of muscle activity and insufficient coordination also presented in shoulder elevation and other functional tasks...
May 2017: Current Sports Medicine Reports
https://www.readbyqxmd.com/read/28498133/numerical-and-experimental-study-of-the-fundamental-flow-characteristics-of-a-3d-gully-box-under-drainage
#12
Pedro Lopes, Rita F Carvalho, Jorge Leandro
Numerical studies regarding the influence of entrapped air on the hydraulic performance of gullies are nonexistent. This is due to the lack of a model that simulates the air-entrainment phenomena and consequently the entrapped air. In this work, we used experimental data to validate an air-entrainment model that uses a Volume-of-Fluid based method to detect the interface and the Shear-stress transport k-ω turbulence model. The air is detected in a sub-grid scale, generated by a source term and transported using a slip velocity formulation...
May 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28497142/methyl-functionalized-mos2-nanosheets-with-reduced-lattice-breathing-for-enhanced-pseudocapacitive-sodium-storage
#13
Lei Huang, Qiulong Wei, Xiaoming Xu, Changwei Shi, Xue Liu, Liang Zhou, Liqiang Mai
Sodium ion batteries (SIBs) possess the potential to realize low-cost and large-scale energy storage due to the abundance of sodium. However, the large ionic radius of sodium often leads to sluggish kinetics and large volume change, limiting the further development of SIBs. Layered MoS2, with a large interlayer distance, is a promising intercalation anode material for SIBs. In this work, we report the synthesis of methyl-functionalized MoS2 (M-MoS2) nanosheets through a facile second solvothermal method. During the second solvothermal treatment, the pristine MoS2 is mostly converted from the 2H to 1T phase and the interlayer distance is expanded from 0...
May 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28490174/self-organization-of-electroactive-suspensions-in-discharging-slurry-batteries-a-mesoscale-modeling-investigation
#14
Garima Shukla, Diego Del Olmo Diaz, Vigneshwaran Thangavel, Alejandro A Franco
We report a comprehensive modeling-based study of electroactive suspensions in slurry redox flow batteries undergoing discharge. A three-dimensional kinetic Monte Carlo model based on the variable step size method is used to describe the electrochemical discharge of a silicon/carbon slurry electrode in static mode (i.e., no fluid flow conditions). The model accounts for Brownian motion of particles, volume expansion of silicon upon lithium insertion, and formation and destruction of conducting carbon networks...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28488221/photosynthetic-electron-and-proton-transport-in-chloroplasts-epr-study-of-%C3%AE-ph-generation-an-overview
#15
Alexander N Tikhonov
This is a brief overview focused on the electron paramagnetic resonance applications to the study of the proton transport processes in chloroplasts. After brief description of structural and functional organization of the chloroplast electron transport chain, our attention is focused on the measurements of trans-thylakoid pH difference (ΔpH) with pH-sensitive spin-probes. The use of spin-probes is based either (i) on measuring the ΔpH-partitioning of spin-probes between the thylakoid lumen and external volume, or (ii) on monitoring changes in the electron paramagnetic resonance spectra of pH-sensitive nitroxide radicals located in the lumen...
May 9, 2017: Cell Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28486214/microdosimetry-calculations-for-monoenergetic-electrons-using-geant4-dna-combined-with-a-weighted-track-sampling-algorithm
#16
Gabriel Famulari, Piotr Pater, Shirin Enger
PURPOSE: The aim of this study was to calculate microdosimetric distributions for low energy electrons simulated using the Monte Carlo track structure code Geant4-DNA. MATERIALS AND METHODS: Tracks for monoenergetic electrons with kinetic energies ranging from 100 eV to 1 MeV were simulated in an infinite spherical water phantom using the Geant4-DNA extension included in Geant4 toolkit version 10.2 (patch 02). The microdosimetric distributions were obtained through random sampling of transfer points and overlaying scoring volumes within the associated volume of the tracks...
May 9, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28485570/tuning-porosity-and-surface-area-in-mesoporous-silicon-for-application-in-li-ion-battery-electrodes
#17
John B Cook, Hyung-Seok Kim, Terri Chai Lin, Shauna Robbennolt, Eric Detsi, Bruce S Dunn, Sarah H Tolbert
This work aims to improve the poor cycle lifetime of silicon based anodes for Li-ion batteries by tuning microstructural parameters such as pore size, pore volume, and specific surface area in chemically synthesized mesoporous silicon. Here we have specifically produced two different mesoporous silicon samples from the magnesiothermic reduction of ordered mesoporous silica in either argon or forming gas. In-situ X-ray diffraction studies indicate that samples made in Ar proceed through a Mg2Si intermediate, and this results in samples with larger pores (diameter ~90 nm), modest total porosity (34%), and modest specific surface area (50 m2 g-1)...
May 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28481344/dynamic-chemical-expansion-of-thin-film-non-stoichiometric-oxides-at-extreme-temperatures
#18
Jessica G Swallow, Jae Jin Kim, John M Maloney, Di Chen, James F Smith, Sean R Bishop, Harry L Tuller, Krystyn J Van Vliet
Actuator operation in increasingly extreme and remote conditions requires materials that reliably sense and actuate at elevated temperatures, and over a range of gas environments. Design of such materials will rely on high-temperature, high-resolution approaches for characterizing material actuation in situ. Here, we demonstrate a novel type of high-temperature, low-voltage electromechanical oxide actuator based on the model material PrxCe1-xO2-δ (PCO). Chemical strain and interfacial stress resulted from electrochemically pumping oxygen into or out of PCO films, leading to measurable film volume changes due to chemical expansion...
May 8, 2017: Nature Materials
https://www.readbyqxmd.com/read/28480936/high-density-equilibrium-phases-of-colloidal-ellipsoids-by-application-of-optically-enhanced-direct-current-electric-fields
#19
Mahesh Ganesan, Michael J Solomon
We use direct current (DC) electric fields in conjunction with ultraviolet light to self-assemble highly dense structures of colloidal ellipsoids with three-dimensional order and volume fraction as large as 67%. Ellipsoidal phases of colloids are of fundamental interest because novel packing structures are predicted to occur at high volume fractions; the symmetries of these crystal unit cells can also contribute to a variety of applications, including structural color materials. Previously, the very high volume fraction range of ellipsoidal phases has been inaccessible because of limitations such as vitrification and kinetic trapping...
May 8, 2017: Soft Matter
https://www.readbyqxmd.com/read/28479494/gastric-mucosal-devitalization-reduces-adiposity-and-improves-lipid-and-glucose-metabolism-in-obese-rats
#20
Andreas Oberbach, Nadine Schlichting, Marco Heinrich, Yvonne Kullnick, Ulf Retschlag, Stefanie Lehman, Mouen A Khashab, Anthony N Kalloo, Vivek Kumbhari
BACKGROUND AND AIMS: The gastric mucosa is an endocrine organ that regulates satiation pathways by expression of orexigenic and anorexigenic hormones. Vertical sleeve gastrectomy (VSG), excludes gastric mucosa and reduces gastric volume. Our study aims to investigate the independent effects of altering gastric mucosa on obesity and its related comorbidities. METHODS: Gastric mucosal devitalization (GMD) of 70% of the stomach was achieved by argon plasma coagulation in a high-fat diet (HFD) rat model and compared with VSG and sham (SH)...
May 4, 2017: Gastrointestinal Endoscopy
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