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Circumbinary planet study around NSVS 14256825

Journal of Physics: Conference Series 2019年第1期1380卷

作者： P Sappankum S Komonjinda S Awiphan R Rattanamala V S Dhillon T R Marsh S Suphapolthaworn Master of Science Program in Astronomy Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand National Astronomical Research Institute of Thailand (Public Organization) 260 Moo 4 Donkaew Mae Rim Chiang Mai 50180 Thailand Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand PhD Program in Astronomy Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Department of Physics and General Science Faculty of Science and Technology Nakhon Ratchasima Rajabhat University Nakhon Ratchasima 30000 Thailand Department of Physics and Astronomy University of Sheffield Sheffield S3 7RH UK Department of Physics University of Warwick Coventry CV4 7AL UK Department of Physics School of Science Hokkaido University Sapporo Hokkaido 060-0808 Japan

The period variability of (O-C) diagram of an eclipsing binary, NSVS 14256825, which is composed of a hot subdwarf type OB star (sdOB) and a main-sequence low-mass type M star (dM) in close orbit with period P=0.110374 days, previously showed sinusoidal signal cause by the light travel time effects. This signal can be caused by the presence of third bodies. We re-examined (O-C) diagram of the system. We combined eclipse timings from published data and the data taken from ULTRASPEC at 2.4 m at Thai National Telescope on November 2018. From the fitting model, the parameters of the third body in NSVS 14256825 system are obtained.

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Evaluation of Southwest Monsoon Change over Thailand by High-resolution Regional Climate Model under High RCP Emission Scenario

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Journal of Physics: Conference Series 2018年第1期1144卷 012112-012112页

作者： Arpornrat, Theerapat Ratjiranukool, Sujittra Ratjiranukool, Pakpoom Sasaki, Hidekata Master’s Degree Program in Applied Physics Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai Thailand. Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai Thailand. Department of Physics Faculty of Science and Technology Chiang Mai Rajabhat University Chiang Mai Thailand. Meteorological Research Institute Tsukaba Japan.

The 5×5 km resolution of Non-Hydrostatic Regional Climate Model (NHRCM) developed by Meteorological Research Institute, Japan was used to evaluate the southwest monsoon season that affects to Thailand during mid-May until mid-October in each years. Bulk-type cloud microphysics, Kain-Fritsch convective scheme, Mellor-Yamada-Nakanishi-Niino level 3 PBL scheme, clear-sky radiation scheme and Hirai-Ohizumi land surface scheme are used as model configuration to simulate climate data under high emission scenario-RCP 8.5. This research was conducted for 2 time periods, i.e., baseline period (1981–2000) and future period (2080–2099), to estimate the southwest monsoon season onset and offset over Thailand by using average wind vector and cumulative precipitation in consecutive 5 days (pentad). Furthermore, the rain-break phase, less precipitation ranges during the southwest monsoon season, had also been analysed.

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Electroplating of ZnO Influenced by the Concentration of Aluminum Nitrate in the Bath

Electroplating of ZnO Influenced by the Concentration of Alu...

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2016 International Conference on materials science and Nanotechnology

作者： Jing-Chie Lin Amrita Choudhury Yao-Tien Tsneg Kun-Cheng Peng Institute of Materials Science and Engineering “Central University” International Master Degree Program in Applied Materials Science “Central University” Department of Materials Science and Engineering Mingchi University of Technology

Electrochemical deposition of Al-doped ZnO（AZO） on the ITO glass was investigated in baths containing various concentrations of aluminum nitrate. The electrochemical and chemical reactions can be deduced by means of investigating cathodic polarization curves and time/electroplating-current curves for further characterizing structures of ZnO and AZO, and establishing growth mechanism. High-quality AZO nanorods, depositing on ITO substrate that coated with ZnO seed-layer, were utilized the electrochemical method at-1.0 V（against a reference electrode of Ag/AgC l in 3.0 M KCl） in the bath of 90 °C. After annealing at 350 °C, ZnO and AZO nanorods were analyzed by field-emission scanning electron microscope（FESEM） to explore the morphology of nanostructure. The SEM image displayed that the lower Al concentrations（20 ~ 60 μM） in the bath, the average diameter of nanorods decreased;while the Al concentrations excessed over 60 μM, the morphology of the AZO nanorods turned into partial-area nanosheets instead of the nanorods spread. The crystal structure of the AZO nanorods were identified by using grazing-incident X-ray diffraction（GIXRD）. The patterns of the Al ions in the range of 20 ~ 60 μM in the bath showed that the preferred orientations were along with the [002] direction which confirmed the result of AZO nanorods well aligned in c-axis orientation, and the characterized peak（002） slightly shifted to the right suggested that Al atoms had doped into the ZnO lattice. We also adopted the X-ray photoelectron spectroscopy to characterize the elemental and chemical compositions of the AZO nanorods. XPS spectrums confirmed that the Al atoms successfully doped. Finally, for identifying the optimal boundary condition of Al content in ZnO, the nanorods with various Al concentrations were utilized via dye-sensitized solar cells（DSSC） experiment with the standard solar Simulators（AM1.5 G） and J-V Measurement. We found that the AZO nanorods as the photoanode contained 2.84 at.% A

关键词： Al-doped ZnO electrochemical deposition Dye-Sensitized Solar Cells aluminum concentration X-ray photoelectron spectroscopy

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The Impact of Clay Loading on the Relative Intercalation of Poly(Vinyl Alcohol)-Clay Composites

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Journal of materials science and Chemical Engineering 2016年第10期4卷 20-31页

作者： Moustafa M. Zagho Mahmoud M. Khader Center for Advanced Materials Qatar University Doha Qatar Materials Science and Technology Master Program College of Arts and Science Qatar University Doha Qatar Gas Processing Center College of Engineering Qatar University Doha Qatar

Polymer clay nanocomposites (PCN) materials are industrially applied because of their unique properties. However many of their physical and chemical properties have not been determined. The formed structures of polymer/clay nanocomposite depend on the nature of interactions between polymer chains and clay platelets. According to the possible modes of interactions between polymer matrix and clay sheets, these nanocomposites can be classified into: intercalated, flocculated and exfoliated nanocomposites. In this work, the morphology of the nanocomposite was studied using X-ray diffraction (XRD) and nanoscaning electron microscopy (NSEM). XRD and NSEM measurements confirmed the intercalation between poly(vinyl alcohol) chains and cloisite®20A sheets. Because of the intercalation between the clay platelets and the PVA chains, as the clay concentration increases as the band intensities in FT-IR spectra increase. On the other hand, the XRD did not provide clear shift of any of the clay peaks for PVA/cloisite® 10A nanocomposites and confirm the non-intercalation between PVA matrix and cloisite®10A platelets. The relative intercalation (RI) of PVA/Cloisite®20A nanocomposites declined with increase in the clay loadings. In contrast, for PVA/Cloisite®10A, RI values slightly increased with increasing the clay loading.

关键词： Poly(Vinyl Alcohol) Cloisite Nanocomposites Relative Intercalation FT-IR Spectra

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Application of nanocatalyst iron oxide (Fe2O3) to reduce exhaust emissions (CO and HC)

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IOP Conference Series: materials science and Engineering 2018年第1期432卷

作者： P Puspitasari C Yazirin L A Bachtiar J W Dika SM S N S Zaharis Mechanical Engineering Department Engineering Faculty Malang State University Semarang street 5 Malang East Java Indonesia Center of Nano Research and Advanced Materials Malang State University Semarang street 5 Malang East Java Indonesia Master Program of Mechanical Engineering Engineering Faculty Malang State University Semarang street 5 Malang East Java Indonesia Bachelor Program Mechanical Engineering Department Malang State University Semarang street 5 Malang East Java Indonesia Industrial Chemical Technology Programme Faculty of Science and Technology Universiti Sains Islam Malaysia Bandar Baru Nilai 71800 Nilai Negeri Sembilan

Fe2O3 has been the interest of many studies due to its applications in various scientific and industrial fields including in environment, corrosion, soil science, and exhaust emissions. Fe2O3 is a chemical mixture that can be applied as a catalyst to reduce exhaust emissions because it is capable of binding CO and HC contained in motorcycle exhaust gases The growth of motor vehicles results in air pollution and an increase in exhaust emissions consisting of 70.50% CO and 18.34% HC. One effort to reduce exhaust emission levels is by applying a catalytic converter to the exhaust system. This research was an experimental research aiming to investigate the difference in emission level of CO and HC between a motorcycle with and without a catalytic converter. The types of fuel used were RON 88, RON 90, RON 92, and RON 98. The results showed that the application of Fe2O3 as a catalyst could reduce the level of CO significantly in RON 88, i.e. 91.43% CO, and the level of HC in RON 88 and RON 92, i.e. 53.27% and 91.07% HC respectively.

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The Impact of Clay Loading on the Relative Intercalation of Poly(Vinyl Alcohol)-Clay Composites

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Journal of materials science and Chemical Engineering（材料科学与化学工程） 2016年第10期

作者： Moustafa M. Zagho Mahmoud M. Khader Center for Advanced Materials Qatar University Materials Science and Technology Master Program College of Arts and Science Qatar University Gas Processing Center College of Engineering Qatar University

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Titanium oxynitride thin films as high-capacity and high-rate anode materials for lithium-ion batteries

Titanium oxynitride thin films as high-capacity and high-rat...

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作者： Chiu, Kuo-Feng Su, Shih-Hsuan Leu, Hoang-Jyh Hsia, Chen-Hsien Department of Materials Science and Engineering Feng Chia University 100 Wenhwa Rd. Taichung40724 Taiwan Master's Program of Green Energy Science and Technology Feng Chia University 100 Wenhwa Rd. Taichung40724 Taiwan

Titanium oxynitride (TiOxNy) was synthesized by reactive magnetron sputtering in a mixed N2/O2/Ar gas at ambient temperature. TiOxNy thin films with various amounts of nitrogen contents were deposited by varying the N2/O2 ratios in the background gas. The synthesized TiOxNy films with different compositions (TiO1.837N0.060, TiO1.890N0.068, TiO1.865N0.073, and TiO1.882N0.163) all displayed anatase phase, except TiO1.882N0.163. The impedances and grain sizes showed obvious variations with the nitrogen contents. A wide potential window from 3.0 V to 0.05 V, high-rate charge-discharge testing, and long cycle testing were applied to investigate the performances of synthesized TiOxNy and pure TiO2 as anodes for lithium-ion batteries. These TiOxNy anodes can be cycled under high rates of 125 μA/cm2 (10 °C) because of the lower charge-transfer resistance compared with the TiO2 anode. At 10 °C the discharge capacity of the optimal TiOxNy composition is 1.5 times higher than that of pure TiO2. An unexpectedly large reversible capacity of ~ 300 μAh/cm2 μm (~ 800 mAh/g) between 1.0 V and 0.05 V was recorded for the TiOxNy anodes. The TiOxNy anode was cycled (3.0 V to 0.05 V) at 10 °C over 300 times without capacity fading while delivering a capacity of ~ 150 μAh/cm2 μm (~ 400 mAh/g). © 2015 Elsevier B.V. All rights reserved.

关键词： Thin films

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Superhydrophilic self-cleaning surfaces based on TiO₂ and TiO₂/SiO₂ composite films for photovoltaic module cover glass

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Applied Adhesion science 2015年第1期3卷 1-9页

作者： Jesus, Magnum Augusto Moraes Lopes de Neto, João Trajano da Silva Timò, Gianluca Paiva, Paulo Renato Perdigão Dantas, Maria Sylvia S Ferreira, Angela de Mello Master Program in Materials Engineering Centro Federal de Educação Tecnológica de Minas Gerais – campus I Av. Amazonas 5253 Nova Suiça 30421-169 Belo Horizonte MG Brazil Ricerca Sul Sistema Energetico - RSE S.p.A Le Mose Piacenza 29100 Italy National Institute of Science and Technology on Mineral Resources Water and Biodiversity (INCT-Acqua) - Av. Antônio Carlos 627 Pampulha 31270-901 Belo Horizonte MG Brazil Chemistry Department Centro Federal de Educação Tecnológica de Minas Gerais – campus I Av. Amazonas 5253 Nova Suiça 30421-169 Belo Horizonte MG Brazil

Self-cleaning surfaces have excelled in recent years in energy and environmental fields. In particular, in solar energy area, these surfaces are used to avoid soiling accumulation on photovoltaic (PV) modules. So far TiO₂ has been widely used due to its photocatalytic activity and photo-induced superhydrophilicity. However, this oxide has some limitations since it reduces the glass transmittance and it rapidly reestablish the water contact angle in dark environments. In order to circumvent these limitations, composites TiO₂/SiO₂ have been proposed. For photovoltaic application, besides a good transparency in the wavelength region 300–1800 nm and self-cleaning properties, the coating should also present long durability and adequate adhesion to endure the outdoor conditions. Aiming at developing a coating with these properties, in this work, TiO₂/SiO₂ composites containing different titanium content have been synthesized and compared with pure TiO₂ films in relation to adhesion, transparency and hydrophilicity. Both films have been deposited over low iron float glass substrates by sol–gel dip-coating technique and different calcination temperatures (400, 500, 600°C) and Si/Ti molar rates (Si₈₆Ti₁₄, Si₄₀Ti₆₀) have been considered. TiO₂/SiO₂ films showed higher transmittance in visible range compared with pure TiO₂. TiO₂/SiO₂ films showed superhydrophilic character before and after ultraviolet irradiation, with water contact angles near to 0°. Furthermore, as predicted, TiO₂/SiO₂ films could keep the superhydrophilic character in dark environments, in contrast with pure TiO₂ films. Both TiO₂ and TiO₂/SiO₂ films exhibited good adherence and it is shown that higher calcination temperatures and higher titanium content enhance such property. All f

关键词： Self-cleaning surfaces Sol–gel Superhydrophilicity Thin film TiO2 TiO2/SiO2 composite

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Roles of organic acids during exectrooxidation reaction over Pt-supported carbon electrodes in direct methanol fuel cells

Roles of organic acids during exectrooxidation reaction over...

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作者： Wong, Chee Yong Chen, Shi-Kun Lo, An-Ya Tseng, Chuan-Ming Lin, Chiu-Yue Liu, Shang-Bin Department of Materials Science and Engineering Fong Chia University Taichung 40724 Taiwan Green Energy Development Center and Master's Program of Green Energy Science and Technology Fong Chia University Taichung 40724 Taiwan Institute of Physics Academia Sinica Taipei 11529 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei 10617 Taiwan Department of Chemistry National Taiwan Normal University Taipei 11677 Taiwan

A comprehensive study has been made to explore the role of organic acids on electrocatalytic performances of platinum (Pt) nanoparticles supported on carbon porous materials (CPMs) in proton exchange membrane fuel cells (PEMFCs). In particular, the effects of carboxylic acids (R-COOH), viz. formic acid, acetic acid, propionic acid, and butyric acid on catalytic activity, stability, and durability of anodic Pt/CPM electrocatalyst in direct methanol fuel cells (DMFCs) were investigated. In the presence of doped carboxylic acids, the electrooxidative activity of Pt/CPM follows the trend: HCOOH 3COOH 2H5COOH 3H 7COOH, revealing a consistent increase in the severity of catalyst deactivation with the number of carbons on the alkyl chain of the dopant. The Pt/CPM was found to exhibit electrocatalytic performances and tolerance for poisoning than a commercial Pt/XC-72 catalyst with a similar Pt loading (20 wt%). Moreover, a notable increase in mass activity up to ca. 150% over the spent Pt/CPM catalyst was observed up on removing the organic acid in the feed stream, indicating that catalyst poisoning by deactivation may be revived, even to its "intrinsic" activity. © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Electrocatalysts

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Structural and optical properties of buried InAs/GaAs quantum dots on GaAsSb buffer layer

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Journal of Physics D: Applied Physics 2009年第18期42卷

作者： Wu, Y.H. Chang, Li Lin, P.Y. Chiang, C.H. Chen, J.F. Chi, T.W. Department of Materials Science and Engineering National Chiao-Tung University Hsinchu 30050 Taiwan Industrial Technology Research and Development Master Program on Semiconductor Materials and Processing National Chiao-Tung University Hsinchu 30050 Taiwan Department of Eletrophysics National Chiao-Tung University Hsinchu 30050 Taiwan Electronics and Optoelectronics Research Laboratories Industrial Technology Research Institute Hsinchu 30050 Taiwan

In this work, we investigated the effect of a 1 nm thick GaAs 94.3Sb0.57 buffer layer on structural and optical properties of buried InAs quantum dots (QDs) and wetting layers (WLs) in GaAs using photoluminescence (PL) and transmission electron microscopy (TEM). The density and emission wavelength of the QDs on the buffer were increased due to the size and the shape modification in comparison with those without a buffer. PL analysis of the ground-state (GS) peak of the QDs on the buffer showed a red-shift of 18 meV with an enhanced intensity. In addition, PL and TEM show that the buffer has a weak effect on the WLs and no apparent changes occur for the buffer during QD deposition and the capping process. © 2009 IOP Publishing Ltd.

关键词： Buffer layers

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