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Preparation of zeolite N from metakaolinite by hydrothermal method
Paiboon Sengyang,Kunwadee Rangsriwatananon,Aphiruk Chaisena 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.1
Zeolite N was successfully prepared from activated Narathiwat kaolinite. Kaolinite activation was performed by the thermal treatment at 700 o C for 5 h. The thermally activated, amorphous kaolinite (metakaolinite) was treated hydrothermally with KOH, KCl, and H2O at 80, 90, 110, 130, 150, and 175 o C during different reaction times ranging from 2 h to 24 h. The synthesis products were characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy in order to elucidate their physicochemical and characteristics. The results show that zeolite N was obtained with high crystalline when the K2O/Al2O3, KCl/Al2O3, and H2O/Al2O3 molar ratios were 2.3, 3.5, and 48.0 by hydrothermal treatment at 175 o C for 24 h. The cation exchange capacity of zeolite N was 590 meq 100 g−1 . Thus, the kaolinite can be used as a source of silica and alumina for the synthesis of zeolite N.
Influence Study of Aluminum Dross on Polypropylene Matrix-Polymer Composite Material Properties
Khanob Kongchatree,Paiboon Yaemphuan,Jesada Kaewwichit,Waraporn Roybang,Kittipong Kimapong 국제문화기술진흥원 2015 International Journal of Advanced Culture Technolo Vol.3 No.1
This paper is aimed to study the influence of aluminium dross from Thai aluminum casting factory on polypropylene matrix-polymer composite material properties. The summarized experimental results are as follows. An increase in the amount of aluminum dross polymer composite material affected to increase hardness, modulus of elasticity and abrasion resistance. However, the increase of the aluminum dross had no effects to change the yield strength and the melting temperature of the polymer composite material. The aluminum dross also affected to form the crystallinity at 117-122 ℃ and directly increased the rigid property of the composite materials. The microstructure examination revealed that the aluminum dross was located in a polymer matrix and affected to increase the dark colour of the polymer composite material.
Influence Study of Aluminum Dross on Polypropylene Matrix-Polymer Composite Material Properties
Kongchatree, Khanob,Yaemphuan, Paiboon,Kaewwichit, Jesada,Roybang, Waraporn,Kimapong, Kittipong The International Promotion Agency of Culture Tech 2015 International Journal of Advanced Culture Technolo Vol.3 No.1
This paper is aimed to study the influence of aluminium dross from Thai aluminum casting factory on polypropylene matrix-polymer composite material properties. The summarized experimental results are as follows. An increase in the amount of aluminum dross polymer composite material affected to increase hardness, modulus of elasticity and abrasion resistance. However, the increase of the aluminum dross had no effects to change the yield strength and the melting temperature of the polymer composite material. The aluminum dross also affected to form the crystallinity at $117-122^{\circ}C$ and directly increased the rigid property of the composite materials. The microstructure examination revealed that the aluminum dross was located in a polymer matrix and affected to increase the dark colour of the polymer composite material.
Varavut Tanamool,Tsuyoshi Imai,Paiboon Danvirutai,Pakawadee Kaewkannetra 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.1
This work revealed for the first time the possible use of a newly isolated Bacillus aryabhattai PKV01 for poly-β-hydroxyalkanoates (PHAs) production from fermentative sweet sorghum juice. Its growth and PHA production were investigated under different pH and nitrogen sources. Medium composition was optimized using statistical tools. The highest biomass and PHA content were reached at pH 6.5 with the use of urea. Plackett-Burman design was then applied to test the relative importance of medium components and process variables on cell growth and PHA production. Cell growth and PHAs production were affected by total sugar and urea and were subjected to optimize the sorghum juice medium using response surface methodology (RSM) via central composite design (CCD). The predicted optimal culture composition was achieved. Maximum dry cell weight and PHAs were obtained using a flask and almost double the amount was achieved using a bioreactor. After PHA recovery,the structure and thermal properties were characterised and revealed to be similar to the standard of poly-β-hydroxybutyrate (PHB).
Laksana Laokiat,Nurak Grisdanurak,Pongtanawat Khemthong,Paiboon Sreearunothai,Wanwisa Pattanasiriwisawa,Wantana Klysubun 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.3
Transition metal (Fe, V and W)-doped TiO2 was synthesized via the solvothermal technique and immobilized onto fiberglass cloth (FGC) for uses in photocatalytic decomposition of gaseous volatile organic compounds--benzene, toluene, ethylbenzene and xylene (BTEX)--under visible light. Results were compared to that of the standard commercial pure TiO2 (P25) coated FGC. All doped samples exhibit higher visible light catalytic activity than the pure TiO2. The V-doped sample shows the highest photocatalytic activity followed by the W- and Fe-doped samples. The UV-Vis diffuse reflectance spectra reveal that the V-doped sample has the highest visible light absorption followed by the W- and Fe-doped samples. The X-ray diffraction (XRD) patterns indicate that all doped samples contain both anatase and rutile phases with the majority (>80%) being anatase. No new peaks associated with dopant oxides can be observed, suggesting that the transition metal (TM) dopants are well mixed into the TiO2 lattice, or are below the detection limit of the XRD. The X-ray absorption near-edge structure spectra of the Ti K-edge transition indicate that most Ti ions are in a tetravalent state with octahedral coordination, but with increased lattice distortion from Fe- to V- and W-doped samples. Our results show that the TM-doped TiO2 were successfully synthesized and immobilized onto flexible fiberglass cloth suitable for treatment of gaseous organic pollutants under visible light.
Re-examination of Opisthorchis viverrini Infection in Northeast Thailand
Yeoh, Kheng-Wei,Promthet, Supannee,Sithithaworn, Paiboon,Kamsaard, Supot,Parkin, Donald Maxwell Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.8
Background: Liver fluke infection caused by the parasite Opisthorchis viverrini (O. viverrini), a human carcinogen, is endemic in north-eastern Thailand and remains a major health problem. Objectives: The objectives of the study were to (1) resurvey the prevalence of O. viverrini infection in a field site from the Khon Kaen Cohort Study (in newly recruited subjects as well as previous cohort subjects surveyed in 1992); (2) investigate how subjects' lifestyle habits and their exposure to health promotion initiatives influence changes in prevalence of O. viverrini infection. Materials and Methods: The prevalence of O. viverrini infection in the cohort subjects (as well as new subjects) was investigated using faecal egg counts. Information on demographic factors, lifestyle and awareness of health promotion initiatives were obtained through questionnaires. Results: O. viverrini infection rates in the same individuals of the cohort were lower in 2006 than in 1992. Also, by studying the period effect, the current 35-44 year olds had a 12.4% (95% CI 3.9% to 20.9%) lower prevalence of O. viverrini infection than the 35-44 year olds in 1992 (24.2% versus 11.8%). Lifestyle choices showed that smoking and alcohol consumption were associated with an increased chance of acquiring O. viverrini infection with adjusted odds ratios of 10.1 (95%CI 2.4-41.6) and 5.3 (95%CI 1.2-23.0), respectively. Conclusions: Our study has demonstrated that although the prevalence of O. viverrini infection over a 14-year period has decreased, unhealthy lifestyle was common with smoking and alcohol consumption being associated with increased chances of infection, emphasising the double burden of disease which developing countries are facing.
Pornpote Piumsomboon,Kronkanok Hongthong,Kejvalee Pruksathorn,Paiboon Sripakagorn 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.4
research focuses on the effect of the geometry and patterns of the gas flow channel on the PEM fuelcell performance. Simulation was conducted and the results were verified by experiments. Three-dimensional, singlephase, compressible and isothermal models of 5 cm2 electrodes, anode and cathode, were developed and studied byutilizing a comercial Computational Fluid Dynamics (CFD) software, FLUENT 4.5. Two types of gas flow channelwere investigated: conventional and interdigitated. The results showed that the flow channel pattern does not have amance. The interdigitated design provides a higher limiting curent density and cell performance than the conven-tional design on the cathode side. Moreover, the cell performance does not depend on the inlet and outlet channelwidths. On the contrary, for the interdigitated design, it was influenced by the shoulder width. Finally, experimentswere conducted to validate the simulation results.
Songserm, Nopparat,Promthet, Supannee,Wiangnon, Surapon,Sithithaworn, Paiboon Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.12
Intestinal parasitic infections (IPIs) are still important to the health of Thai rural residents. IPIs are the cause of many chronic diseases with, for example, opisthorchiasis resulting in progression to cholangiocarcinoma (CCA). This cross-sectional study in a prospective cohort study aimed to examine the prevalence and co-infection of intestinal parasites among Northeastern Thai rural residents, recruited into the Khon Kaen Cohort Study (KKCS), and who were residing in areas of high-risk for developing CCA. On recruitment, subjects had completed questionnaires and provided fecal samples for IPI testing using the formalin ethyl acetate concentration technique. Data on selected general characteristics and the results of the fecal tests were analysed. IPI test results were available for 18,900 of cohort subjects, and 38.50% were found to be positive for one or more types of intestinal parasite. The prevalence of Opisthorchis viverrini (O. viverrini) infection was the highest (45.7%), followed by intestinal flukes (31.9%), intestinal nematodes (17.7%), intestinal protozoa (3.02%), and intestinal cestodes (1.69%). The pattern of different infections was similar in all age groups. According to a mapping analysis, a higher CCA burden was correlated with a higher prevalence of O. viverrini and intestinal flukes and a greater intensity of O. viverrini. Both prevention and control programs against liver fluke and other intestinal parasites are needed and should be delivered simultaneously. We can anticipate that the design of future control and prevention programmes will accommodate a more community-orientated and participatory approach.