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1.
PAPER CURRENT
Novel etchings to transfer CVD-grown graphene from copper to arbitrary substrates (2014)
Publication Date: 2014-09-22
Description: Publication date: 20 October 2014 Source:Chemical Physics Letters, Volume 614 Author(s): M.P. Lavin-Lopez , J.L. Valverde , A. Garrido , L. Sanchez-Silva , P. Martinez , A. Romero-Izquierdo Novel and simple etchings for direct transfer of CVD-grown graphene on Cu to arbitrary substrates are reported in this paper. Besides the classical transfer method using FeCl3, two novel etching solutions have been used for depositing graphene over different substrates: HF:2Na2CO3·3H2O2 (4:1) and H2O2 (30% p./v.):aqua Regis (1HNO3:3HCl):H2O (1:1:2). By using these etching solutions, graphene was firstly transferred to PET wafers and then to arbitrary substrates (microscope slides). The resulting materials were analyzed and discussed in detail using Raman Spectroscopy. Graphical abstract
Print ISSN: 0009-2614
Electronic ISSN: 1873-4448
Topics: Chemistry and Pharmacology , Physics
Published by Elsevier
2.
PAPER CURRENT
Topographic modeling and analysis of the landing site of Chang'E-3 on the Moon (2014)
Publication Date: 2014-09-22
Description: Publication date: 1 November 2014 Source:Earth and Planetary Science Letters, Volume 405 Author(s): Bo Wu , Fei Li , Lei Ye , Si Qiao , Jun Huang , Xueying Wu , He Zhang The Chinese lunar probe Chang'E-3, carrying the “Jade Rabbit” lunar rover, successfully landed in the Sinus Iridum area on the Moon on December 14, 2013. This paper presents the characterization activities that were done for the selection of the landing area, including topographic modeling and analysis based on multisource lunar remote sensing data. Seven meter-resolution Chang'E-2 imagery and Lunar Orbiter Laser Altimeter data were integrated to generate a digital elevation model (DEM) with a resolution of 20 m for the entire Sinus Iridum landing area. Long baseline slopes were assessed according to this DEM for all of this area. Lunar Reconnaissance Orbiter narrow-angle camera images and 1.5 m-resolution Chang'E-2 imagery were used to derive DEMs with higher resolution (4 m) at several local regions within the Sinus Iridum landing area. Slope analyses at lander footprint scale ( ∼ 8   m ) were performed in these local regions. Craters were detected from the DEMs and the derived orthophotos, and size-frequency distributions were generated. Crater morphological statistics, including the depth/diameter ratios, rim height/diameter ratios and wall slopes, were analyzed. The results showed that the Sinus Iridum landing area is relatively flat. Most of the area has slopes of less than 15°. The steeper slopes are mainly alongside craters and ridges. The crater size-frequency distribution is close to the equilibrium distribution. The crater ages, as indicated by their morphological statistics, vary from mature to relatively fresh in different regions. These topographic modeling and analysis results were used for strategic planning to identify the landing site for the Chang'E-3 and made a useful contribution to the success of the Chang'E-3 mission.
Print ISSN: 0012-821X
Electronic ISSN: 1385-013X
Topics: Geosciences , Physics
Published by Elsevier
3.
PAPER CURRENT
Comparative study of electrochemical properties of different composite cathode materials associated to stable proton conducting BaZr0.7Pr0.1Y0.2O3-δ electrolyte (2014)
Publication Date: 2014-09-22
Description: Publication date: 10 November 2014 Source:Electrochimica Acta, Volume 146 Author(s): Yihan Ling , Fang Wang , Ling Zhao , Xingqin Liu , Bin Lin High-temperature proton conductor BaZr0.7Pr0.1Y0.2O3-δ (BZPY) was investigated as electrolyte for intermediate temperatures (400-800°C) solid oxide fuel cells (IT-SOFCs), which exhibited excellent chemical stability in atmospheres containing CO2 and water vapor. In addition, both La0.4Sr0.6Co0.2Fe0.8O3-δ -BaZr0.7Pr0.1Y0.2O3-δ (LSCF-BZPY) and La0.4Sr0.6Co0.2Fe0.8O3-δ -Ce0.8Sm0.2O1.9 (LSCF-SDC) composite oxides were fabricated and evaluated as working cathodes for anode-supported IT-SOFCs based upon thin BZPY electrolytes. The single cells with LSCF-BZPY cathode showed the maximum power density of 86.7 mWcm−2 at 700°C and the calculated activation energy was 91.19kJmol-1. While the cells with LSCF-SDC cathode exhibited the higher maximum power density of 112.4 mWcm−2 at 700°C and the calculated activation energy was 101.61kJmol-1. The experimental results indicated that proton electron mixed conducting composite cathodes are more promising and beneficial than oxygen-ion electron mixed conducting composite cathodes for proton-conducting SOFCs during actual low operating temperatures.
Print ISSN: 0013-4686
Electronic ISSN: 1873-3859
Topics: Chemistry and Pharmacology , Physics
Published by Elsevier
4.
PAPER CURRENT
Preparation of 3D PbO2 nanospheres@SnO2 nanowires/Ti Electrode and Its Application in Methyl Orange Degradation (2014)
Publication Date: 2014-09-22
Description: Publication date: 10 November 2014 Source:Electrochimica Acta, Volume 146 Author(s): Xiaolin Li , Xueming Li , Wenjing Yang , Xiaohua Chen , Wulin Li , Binbin Luo , Kuilong Wang The PbO2 nanospheres supported on SnO2 nanowires at Ti substrate (PbO2 nanospheres@SnO2 NWs/Ti) electrode was successfully synthesized through hydrothermal method. The structure and morphology of the electrode were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The electrochemical property was carried out by cyclic voltammogrametry (CV) and UV spectroscopy was used to monitor the changes during the electrochemical degradation process. The results showed that the as-prepared electrode exhibited a three-dimensional (3D) reticulated structure with a large surface area. The average diameter of a single PbO2 nanosphere is about 300nm. XRD distinctively identified that the PbO2 nanospheres was mainly composed of tetragonal-shaped β-PbO2 crystal. The CV results show that methyl orange (MO) can be oxidized on the electrode surface at the potential of+1.3V vs. Ag/AgCl. As much as 92.7% of chemical oxygen demand (COD) was removed in 60min at 25°C and pH 5.0 with an applied current density of 15mA/cm2. Proper degradation mechanism was also proposed. Graphical abstract
Print ISSN: 0013-4686
Electronic ISSN: 1873-3859
Topics: Chemistry and Pharmacology , Physics
Published by Elsevier
5.
PAPER CURRENT
The electric quadrupole moment of O2 (2014)
Publication Date: 2014-09-22
Description: Publication date: 20 October 2014 Source:Chemical Physics Letters, Volume 614 Author(s): Vincent W. Couling , Siyabonga S. Ntombela Room-temperature measurements of the Buckingham effect (electric-field-gradient-induced birefringence, EFGIB) for gaseous oxygen are presented. The traceless electric quadrupole moment of the oxygen molecule has been deduced from these data, with the assumption that the temperature-independent hyperpolarizability contribution to the EFGIB is negligibly small. The value obtained is Θ=(−1.033±0.027)×10−40 Cm2. This value is compared with the best available ab initio quantum computational values in the literature. Graphical abstract Highlights
Print ISSN: 0009-2614
Electronic ISSN: 1873-4448
Topics: Chemistry and Pharmacology , Physics
Published by Elsevier
6.
PAPER CURRENT
Fabrication of liquid crystal based sensor for detection of hydrazine vapours (2014)
Publication Date: 2014-09-22
Description: Publication date: 20 October 2014 Source:Chemical Physics Letters, Volume 614 Author(s): Rajib Nandi , Sachin Kumar Singh , Hemant Kumar Singh , Bachcha Singh , Ranjan K. Singh A novel liquid crystal (LC) based sensor to detect trace level amount of hydrazine vapour has been developed. The LC 4′-pentyl-4-biphenylcarbonitrile (5CB) doped with 0.5wt% 4-decyloxy benzaldehyde (DBA) shows dark to bright optical texture upon exposure of hydrazine vapours as revealed by polarizing optical microscopy under crossed polarizers. The hydrazine interacts with the doped DBA and form diimine compound which disrupt the orientation of aligned 5CB. The interaction between DBA and hydrazine has been also studied by Raman spectroscopy. Graphical abstract
Print ISSN: 0009-2614
Electronic ISSN: 1873-4448
Topics: Chemistry and Pharmacology , Physics
Published by Elsevier
7.
PAPER CURRENT
Three dimensional investigation of the shock train structure in a convergent–divergent nozzle (2014)
Publication Date: 2014-09-22
Description: Publication date: December 2014 Source:Acta Astronautica, Volume 105, Issue 1 Author(s): Seyed Mahmood Mousavi , Ehsan Roohi Three-dimensional computational fluid dynamics analyses have been employed to study the compressible and turbulent flow of the shock train in a convergent–divergent nozzle. The primary goal is to determine the behavior, location, and number of shocks. In this context, full multi-grid initialization, Reynolds stress turbulence model (RSM), and the grid adaption techniques in the Fluent software are utilized under the 3D investigation. The results showed that RSM solution matches with the experimental data suitably. The effects of applying heat generation sources and changing inlet flow total temperature have been investigated. Our simulations showed that changes in the heat generation rate and total temperature of the intake flow influence on the starting point of shock, shock strength, minimum pressure, as well as the maximum flow Mach number.
Print ISSN: 0094-5765
Electronic ISSN: 1879-2030
Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
8.
PAPER CURRENT
S1-ZGV Modes of a Linear and Nonlinear Profile for Functionally Graded Material Using Power Series Technique (2014)
Publication Date: 2014-09-22
Description: The present work deals with functionally graded materials (FGM) isotropic plates in the neighborhood of the first-order symmetric zero group velocity (S1-ZGV) point. The mechanical properties of functionally graded material (FGM) are assumed to vary continuously through the thickness of the plate and obey a power law of the volume fraction of the constituents. Governing equations for the problem are derived, and the power series technique (PST) is employed to solve the recursive equations. The impact of the FGM basic materials properties on S1-ZGV frequency of FGM plate is investigated. Numerical results show that S1-ZGV frequency is comparatively more sensitive to the shear modulus. The gradient coefficient does not affect the linear dependence of ZGV frequency as function of cut-off frequency ; only the slope is slightly varied.
Print ISSN: 1687-6261
Electronic ISSN: 1687-627X
Topics: Physics
Published by Hindawi
9.
PAPER CURRENT
Cellular automata modeling of Scanning Electrochemical Microscopy (SECM) experiments (2014)
Publication Date: 2014-09-22
Description: Publication date: 1 November 2014 Source:Electrochimica Acta, Volume 145 Author(s): M. Lucas , J. Stafiej , C. Slim , S. Delpech , D. di Caprio In this paper we use cellular automata approach to model scanning electrochemical microscopy (SECM) experiments. We simulate SECM current vs distance curve for a negative feedback mode. It shows the effect of the deformation of the diffusion layer around the UME tip close to the substrate surface. We also simulate an experiment where the UME serves to locally dissolve an electrochemically inhomogeneous substrate as a consequence the substrate's geometry changes during the experiment. Our approach gives both quantitative and qualitative information on the simulated experiments. We show that simulations of real three dimensional experiments are already feasible on relatively cheap multigraphical processor unit (GPU) cards in a standard desktop workstation.
Print ISSN: 0013-4686
Electronic ISSN: 1873-3859
Topics: Chemistry and Pharmacology , Physics
Published by Elsevier
10.
PAPER CURRENT
In Silico Screening of Mutated K-Ras Inhibitors from Malaysian Typhonium flagelliforme for Non-Small Cell Lung Cancer (2014)
Publication Date: 2014-09-22
Description: K-ras is an oncogenic GTPase responsible for at least 15–25% of all non-small cell lung cancer cases worldwide. Lung cancer of both types is increasing with an alarming rate due to smoking habits in Malaysia among men and women. Natural products always offer alternate treatment therapies that are safe and effective. Typhonium flagelliforme or Keladi Tikus is a local plant known to possess anticancer properties. The whole extract is considered more potent than individual constituents. Since K-ras is the key protein in lung cancer, our aim was to identify the constituents of the plant that could target the mutated K-ras. Using docking strategies, reported potentially active compounds of Typhonium flagelliforme were docked into the allosteric surface pockets and switch regions of the K-ras protein to identify possible inhibitors. The selected ligands were found to have a high binding affinity for the switch II and the interphase region of the ras-SOS binding surface.
Print ISSN: 1687-8027
Electronic ISSN: 1687-8035
Topics: Biology , Computer Science
Published by Hindawi