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Formation pathway, structural characterization and optimum processing parameters of synthetic topaz – Al2SiO4(OH,F)2 – by CVD

02.08.2015 | Author(s): E. Trujillo-Vázquez, M.I. Pech-Canul, Journal of Solid State Chemistry, 2015

Publication date: October 2015 Source:Journal of Solid State Chemistry, Volume 230 Author(s): E. Trujillo-Vázquez, M.I. Pech-Canul A novel synthesis route for topaz (Al2SiO4(OH,F)2) by chemical vapor deposition (CVD) using Na2SiF6 as solid precursor was developed. Synthesis tests were ...


Sensors, Vol. 15, Pages 18834-18850: A Nano-Thin Film-Based Prototype QCM Sensor Array for Monitoring Human Breath and Respiratory Patterns

31.07.2015 | Selyanchyn, Roman ; Wakamatsu, Shunichi ; Hayashi, Kenshi ; Lee, Seung-Woo, Sensors, 2015

Quartz crystal microbalance (QCM) sensor array was developed for multi-purpose human respiration assessment. The sensor system was designed to provide feedback for human respiration. Thorough optimization of measurement conditions: air flow, temperature in the QCM chamber, frequency measurement ...


Isothermal Gasification of in Situ/ex Situ Coal Char with CO2 in a Micro Fluidized Bed Reaction Analyzer

30.07.2015 | Fang Wang; Xi Zeng; Ruyi Shao; Yonggang Wang; Jian Yu; Guangwen Xu, Energy & Fuels, 2015

The so-called micro fluidized bed reaction analyzer (MFBRA) was adopted to implement the isothermal gasification of in situ coal char with CO2 under minimized external diffusion inhibition. It was done by keeping the reaction atmosphere and temperature in the MFBRA for both coal pyrolysis and ...


Microstructure and growth kinetics of nanocrystalline diamond films deposited in large area/low temperature distributed antenna array microwave‐plasma reactor

29.07.2015 | Benoît Baudrillart, Fabien Bénédic, Ovidiu Brinza, Thomas Bieber, Thierry Chauveau, Jocelyn Achard, Alix Gicquel, physica status solidi (a), 2015

In this paper, we investigate a new distributed antenna array PECVD system, with 16 microwave plasma sources arranged in a 2D matrix, which enables the growth of 4‐inch diamond films using H2/CH4/CO2 gas mixture at low gas pressure, typically below 0.45 mbar, and at substrate temperature of ...


Voltammetric determination of cocaine using carbon screen printed electrodes chemically modified with uranyl Schiff base films

28.07.2015 | Maria Fernanda Muzetti Ribeiro, José Wilmo da Cruz Júnior, Edward Ralph Dockal, Bruce Royston McCord, Marcelo Firmin ..., Electroanalysis, 2015

Abstract Chemically modified screen printed electrodes (CM‐SPE) using [UO2(4‐MeOSalen)(H2O)] ⋅ H2O films were employed in the voltammetric determination of cocaine. The chemical modification was performed by dip coating electrode surfaces (carbon, gold, and platinum) with methanolic solution ...


Ultraviolet Photodissociation Spectroscopy of the Cold K+·Calix[4]arene Complex in the Gas Phase

27.07.2015 | Yoshiya Inokuchi; Kazuki Soga; Kenta Hirai; Motoki Kida; Fumiya Morishima; Takayuki Ebata, Journal of Physical Chemistry A, 2015

The cooling of ionic species in the gas phase greatly simplifies the UV spectrum, which is of special importance when studying the electronic and geometric structures of large systems, such as biorelated molecules and host–guest complexes. Many efforts have been devoted to achieving ion cooling ...


A convection–diffusion porous media model for moisture transport in polymer composites: Model development and validation

24.07.2015 | Liangbiao Chen, Hsing‐Wei Chu, Xuejun Fan, Journal of Polymer Science Part B: Polymer Physics, 2015

ABSTRACT Moisture may cause many detrimental effects to polymers and their composites, thus inhibiting the applications of polymeric materials in hot and humid environments. In this article, a convection–diffusion porous media model is derived to better characterize rapid moisture transport in ...


Energies, Vol. 8, Pages 7582-7592: Performance Comparison between Steam Injected Gas Turbine and Combined Cycle during Frequency Drops

24.07.2015 | Bahrami, Saeed ; Ghaffari, Ali ; Genrup, Magnus ; Thern, Marcus, Energies, 2015

Single-shaft gas turbine and its cycles are sensitive to frequency drops and, therefore, sudden change loads or large frequency dips might affect their stability. This phenomenon is related to the reduction of the air mass flow passing through the machine during the frequency dips, which might ...


Sensors, Vol. 15, Pages 18167-18177: A Micro-Preconcentrator Combined Olfactory Sensing System with a Micromechanical Cantilever Sensor for Detecting 2,4-Dinitrotoluene Gas Vapor

24.07.2015 | Chae, Myung-Sic ; Kim, Jinsik ; Yoo, Yong Kyoung; Kang, Ji Yoon; Lee, Jeong Hoon; Hwang, Kyo Seon, Sensors, 2015

Preventing unexpected explosive attacks and tracing explosion-related molecules require the development of highly sensitive gas-vapor detection systems. For that purpose, a micromechanical cantilever-based olfactory sensing system including a sample preconcentrator was developed to detect ...


Shock Tube Measurements of the Rate Constant of the Reaction NCN + O2

23.07.2015 | Nancy Faßheber, Gernot Friedrichs, International Journal of Chemical Kinetics, 2015

ABSTRACT The rate constant of the comparably slow bimolecular NCN radical reaction NCN + O2 has been measured for the first time under combustion relevant conditions using the shock tube method. The thermal decomposition of cyanogen azide (NCN3) served as a clean high‐temperature source of NCN ...


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