Bibliografías temáticas / Platinum (111)

Literatura académica sobre el tema "Platinum (111)"

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Publicado: 11 de marzo de 2023

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Artículos de revistas sobre el tema "Platinum (111)"

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Fecher, G. H., J. Bansmann, Ch Grünewald, A. Oelsner, Ch Ostertag y G. Schönhense. "Oxidation of rubidium at platinum (111)". Surface Science 307-309 (abril de 1994): 70–75. http://dx.doi.org/10.1016/0039-6028(94)90372-7.

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Kern, Klaus, Rudolf David, Robert L. Palmer, George Comsa y Talat S. Rahman. "Surface phonon dispersion of platinum (111)". Physical Review B 33, n.º 6 (15 de marzo de 1986): 4334–37. http://dx.doi.org/10.1103/physrevb.33.4334.

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Maurice, Vincent y Christian Minot. "Theoretical investigation of the mechanisms for olefinic hydrogenation on platinum(110) and platinum(111) surfaces". Journal of Physical Chemistry 94, n.º 23 (noviembre de 1990): 8579–88. http://dx.doi.org/10.1021/j100386a018.

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Jo, Sam K. y John M. White. "Correlation of photoelectron yields and photodissociation rates of chloromethane on platinum(111) and carbon-covered platinum(111)". Journal of Physical Chemistry 94, n.º 17 (agosto de 1990): 6852–54. http://dx.doi.org/10.1021/j100380a057.

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Komine, Nobuyuki, Tomoko Ishiwata, Jun-ya Kasahara, Erino Matsumoto, Masafumi Hirano y Sanshiro Komiya. "Synthesis and organic group transfer of organodiplatinum complex with a 1,2-bis(diphenylphosphino)ethane ligand". Canadian Journal of Chemistry 87, n.º 1 (1 de enero de 2009): 176–82. http://dx.doi.org/10.1139/v08-111.

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A series of homometallic alkyl- and phenyldinuclear complexes containing one platinum–platinum bond, (dppe)RPt–Pt(η5-Cp)(CO) (R = Me, Et, CH2CMe3, Ph), have been prepared by oxidative addition of the Pt–C bond of PtR(η5-Cp) to Pt(styrene)(dppe), and were characterized by spectroscopic methods and (or) X-ray structure analysis. The geometry at Pt with a dppe ligand is square planar, and the carbonyl and Cp ligand of the Pt(η5-Cp)(CO) moiety lie orthogonal to the coordination plane of former platinum. Competitive organic group transfer reactions along the Pt–Pt bond in these complexes took place to give PtR(η5-Cp)(CO) and PtR(η1-Cp)(dppe) on thermolysis. Alkyl or aryl transfer from Pt with a dppe ligand were enhanced by addition of olefin, whereas treatment with CO and tertiary phosphine ligands causes Cp transfer from Pt(η5-Cp)(CO).Key words: organoplatinum–platinum complex, organic group transfer.
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Garbe, J. y J. Kirschner. "Spin-dependent photoemission intensities from platinum (111)". Physical Review B 39, n.º 14 (15 de mayo de 1989): 9859–64. http://dx.doi.org/10.1103/physrevb.39.9859.

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Jiang, L. Q. y Bruce E. Koel. "Hydrocarbon trapping and condensation on platinum (111)". Journal of Physical Chemistry 96, n.º 22 (octubre de 1992): 8694–97. http://dx.doi.org/10.1021/j100201a008.

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Diebold, Ulrike, Lanping Zhang, John F. Anderson y Pawel Mrozek. "Surface segregation of silicon in platinum(111)". Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 14, n.º 3 (mayo de 1996): 1679–83. http://dx.doi.org/10.1116/1.580318.

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Tachibana, Takeshi, Yoshihiro Yokota, Koichi Miyata, Takashi Onishi, Koji Kobashi, Masayoshi Tarutani, Yoshizo Takai, Ryuichi Shimizu y Yoshihiro Shintani. "Diamond films heteroepitaxially grown on platinum (111)". Physical Review B 56, n.º 24 (15 de diciembre de 1997): 15967–81. http://dx.doi.org/10.1103/physrevb.56.15967.

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Tachibana, Takeshi, Yoshihiro Yokota, Koichi Miyata, Koji Kobashi y Yoshihiro Shintani. "Heteroepitaxial diamond growth process on platinum (111)". Diamond and Related Materials 6, n.º 2-4 (marzo de 1997): 266–71. http://dx.doi.org/10.1016/s0925-9635(96)00733-9.

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Tesis sobre el tema "Platinum (111)"

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Furman, Scott Anthony. "Surface chemistry of iodine on platinum (111)". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ36639.pdf.

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Sun, Grace Siswanto. "Simulations of platinum growth on Pt(111) using density functional theory and kinetic monte carlo simulations /". Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/9672.

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Shiller, Paul Joseph. "Reactions of methanol and carbon monoxide on ad-atom modified platinum(111) and molybdenum(110) surfaces: Molecular orbital study". Case Western Reserve University School of Graduate Studies / OhioLINK, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=case1055946339.

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Zheng, Chaozhi. "Coverage, step and quantum effects on surface diffusion of H on Pt(111) surfaces /". View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202004%20ZHENG.

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Loh, Andrea. "Study of the adsorption and reaction of 1-epoxy-3-butene on platinum(111)". Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1447652.

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Yim, Chi Ming. "LEEM investigations of adsorption and diffusion of CO on the Pt(111) surface /". View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202007%20YIM.

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Ihm, Hyeran. "Thermal activation and intermediates of six-membered cyclic hydrocarbons and alkyl nitrites on Pt(111) and Cu(100) /". Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.

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Ridley, Paul. "Underpotential deposition of lead on gold and platinum (111) electrode surfaces investigated by scanning tunnelling microscopy". Thesis, University of Liverpool, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343615.

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Gómez, Marín Ana María. "Role of Surface Species at Pt(111) in Electrochemical Oxygen Reduction". Doctoral thesis, Universidad de Alicante, 2014. http://hdl.handle.net/10045/42320.

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Den, Boef Martinus. "Assessment of the national DSM potential in mine underground services / M. den Boef". Thesis, North-West University, 2003. http://hdl.handle.net/10394/111.

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ESKOM is moving towards a price structure for electricity which reflects, as far as possible, the real cost of generation. It is called real time pricing (RTP). ESKOM developed this cost structure to coax customers to use more electricity in off-peak periods (low cost of generation) and less electricity in peak periods (high cost of generation). However, many industries do not effectively use these price offerings from ESKOM to the detriment of themselves and ESKOM. In previous research improvements to this situation for the South African mining industry were investigated. ESKOM funded research to find the potential for load shifting on mines using RTP. The RTP investigation focused on the supply side management (SSM) in the mining context of underground services on gold and platinum mines. Elements investigated included the ventilation, cooling and pumping (VCP) systems. (Except for pumps, these plants are generally installed aboveground.) Previous research showed a national RTP and SSM potential to shift 500 MW of electrical load for a period of 5 hours. Through the previous research it became clear that the mines were previously able to react partially to the price signals. However, it was proved by the research that the full load shift potential can only be realised through the use of integrated dynamic simulation and optimisation. An even higher potential exists for load shift and electricity efficiency through demand side management (DSM) on the underground services. Therefore, if underground DSM strategies are combined with SSM strategies, a further and much bigger potential can be exploited to the benefit of ESKOM and the mines. Due to these factors this study was undertaken. Three case study mines were identified for this study. They are Kopanang and Target, both gold mines, and Amandelbult, a platinum mine. The DSM potential on each of these mines was calculated using simulation, calibration, verification and optimisation. These results were presented to mine management to negotiate the implementation of the proposed strategies on one of the mines. Kopanang's management agreed to the implementation of these strategies for a trial period of 3 months after which the success would be evaluated. The results of the implementation, together with the case study results, were used to calculate the national DSM potential in the mining sector through extrapolation. The DSM potential amounts to 650 MW of load per day as well as 5% on electricity consumption. This amounts to a potential saving of R72.1 million per year using current tariffs. This means that ESKOM can save about R5000 million on the building of a new power station to supply the equivalent load to the DSM potential. Now that the national impact has been calculated and discussed, all these findings must be used to motivate the implementation of these strategies throughout the mining sector. A similar project can be undertaken to look at possible DSM strategies in the industrial sector. This might prove to be more difficult as the electricity intensive systems are mostly all linked to the final production. In the mind of management this out-weighs the possible cost savings that can be achieved. ESKOM and the NER will have to rethink their strategy. Through DSM and load shifting actions alone the pending electricity crisis will not be averted. The current tariff structures should be amended to not only reflect the true cost of electricity but also provide incentive for DSM and load shifting. Another problem that must be addressed to achieve the DSM targets set for 2007 is the time that it takes to complete the study as well as the implementation time. Software can easily be created to help in the speeding up of the case study itself, as the process and steps followed, as well as models used, are very generic (at least in the gold and platinum mining sector).
Thesis (Ph.D. (Mechanical Engineering))--North-West University, Potchefstroom Campus, 2004.
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Libros sobre el tema "Platinum (111)"

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Coultas, S. J. Surface studies of single crystal model catalysts: The effect of sulphur on propene adsorption on the (111) face of platinum. Manchester: UMIST, 1995.

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The 101 Platinum-Plus Rules of Media Engagement. New Voices Press, 2005.

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Ladd, Eric y Jim O'Donnell. Using HTML 4 - Java 1.1 - Javascript 1.2 - Platinum Edition. 2a ed. Que Pub, 1998.

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Queen: 101 Reasons to Celebrate Her Majesty - the Platinum Jubilee Edition. Short Books, Limited, 2022.

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Capítulos de libros sobre el tema "Platinum (111)"

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Nowicki, M. y K. Wandelt. "Platinum surfaces in sulfuric acid: Pt(111) – sulfate". En Physics of Solid Surfaces, 925. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-53908-8_233.

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Nowicki, M. y K. Wandelt. "Platinum surfaces in perchloric acid: Pt(111), Pt(100), Pt(110) – perchlorate". En Physics of Solid Surfaces, 922. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-53908-8_230.

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Nowicki, M. y K. Wandelt. "Hydrohalic acid anion interaction with platinum surfaces: Pt(111) – chloride". En Physics of Solid Surfaces, 917. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-53908-8_225.

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Nowicki, M. y K. Wandelt. "Hydrohalic acid anion interaction with platinum surfaces: Pt(111) – bromide". En Physics of Solid Surfaces, 918. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-53908-8_226.

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Nowicki, M. y K. Wandelt. "Hydrohalic acid anion interaction with platinum surfaces: Pt(111) – iodide". En Physics of Solid Surfaces, 919. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-53908-8_227.

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Ross, Philip N. "Long-Range Structural Effects in the Anomalous Voltammetry of Platinum(111)". En ACS Symposium Series, 37–53. Washington, DC: American Chemical Society, 1988. http://dx.doi.org/10.1021/bk-1988-0378.ch003.

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Papanicolaou, N. I. y N. Panagiotides. "Interatomic Potential for Platinum and Self-Diffusion on Pt(111) Surface by Molecular-Dynamics Simulation". En NATO Science for Peace and Security Series A: Chemistry and Biology, 335–44. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2590-6_15.

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Zaera, F., D. A. Fischer, R. G. Carr, E. B. Kollin y J. L. Gland. "Kinetics of Ethylidyne Formation on Platinum(111) Using Near-Edge X-ray Absorption Fine Structure". En ACS Symposium Series, 131–40. Washington, DC: American Chemical Society, 1988. http://dx.doi.org/10.1021/bk-1988-0378.ch009.

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Majima, H. y H. Kinoshita. "Clinical Pharmacokinetics of (R)-(-)-1,1-Cyclobutane-Dicarboxylato-(2-Aminomethylpyrrolidine) Platinum(II) (DWA2114R)". En Platinum and Other Metal Coordination Compounds in Cancer Chemotherapy, 491–98. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-1717-3_56.

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Hlavka, J. J., P. Bitha, S. G. Carvajal, R. G. Child, F. E. Durr, S. A. Lang, Y. I. Lin, H. L. Lindsay, J. P. Thomas y R. E. Wallace. "Two New Water Soluble Platinum Complexes — CL 286, 558 and CL 287, 110". En Platinum and Other Metal Coordination Compounds in Cancer Chemotherapy, 666–69. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-1717-3_75.

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Actas de conferencias sobre el tema "Platinum (111)"

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Cheruvu, N. S., K. S. Chan y G. R. Leverant. "Cyclic Oxidation Behavior of Aluminide, Platinum Modified Aluminide, and MCrAlY Coatings on GTD-111". En ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-468.

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Cyclic oxidation behavior of aluminide, platinum modified aluminide, and MCrAlY coatings has been investigated at three temperatures. Aluminide and platinum modified coatings were deposited on GTD 111 material using an outward diffusion process. CoCrAlY coating was applied on GTD-111 by Electron Beam Physical Vapor Deposition (EB-PVD). The oxidation behavior of these coatings is characterized by weight change measurements and by the variation of β phase present in the coating. The platinum modified aluminide coating exhibited the highest resistance to oxide scale spallation (weight loss) during cyclic oxidation testing. Metallographic techniques were used to determine the amount of β phase and the aluminum content in a coating as a function of cycles. Cyclic oxidation life of these coatings is discussed in terms of the residual β and aluminum content present in the coating after exposure. These results have been used to calibrate and validate a coating life model (COATLIFE) developed at the Material Center for Combustion Turbines (MCCT).
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Bryl, Robert y Ryszard Blaszczyszyn. "The Interaction of Platinum with W[111] Tip: Diffusion, Desorption and Changes of Tip Morphology". En 2006 19th International Vacuum Nanoelectronics Conference. IEEE, 2006. http://dx.doi.org/10.1109/ivnc.2006.335256.

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Titinchi, Salam J. J., Waheed Saban, Leslie Petrik y Hanna S. Abbo. "Synthesis, Characterization and Physiochemical Properties of Platinum Supported on Mesoporous Carbon". En ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology collocated with ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/fuelcell2011-54670.

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Ordered mesoporous carbon (OMC) has been prepared by impregnating the pores of the silica template (SBA-15) with liquid petroleum gas (LPG) or sucrose. The desired support (OMC) was obtained after dissolution with NaOH. Platinum nanoparticles were dispersed on ordered mesoporous carbons using Chemical Vapour Deposition (CVD) method and Pt(acac)2 as metal source. The resulting ordered mesoporous carbon possess a large surface area with high microporosity, and a controlled pore size distribution, High-quality carbon replicas of SBA-15 show an X-ray diffraction peak at low angle, which indicates that the structural periodicity of the (111) planes has been maintained. Their pore volume and specific surface area are high and the pore volume is almost entirely microporous. The synthesized Pt/OMC was characterized by powder X-Ray diffraction, HR-TEM, HR-SEM, EDS, thermogravimetric analysis, and nitrogen adsorption. The performance of Pt catalyst supported OMC was evaluated by electrochemical studies, which shows almost similar activity to the commercial catalyst.
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Mevius, A., T. Link, R. Welte, M. Wacker, T. Wilke y F. Karl. "73 Post-platinum treatment landscape in patients with recurrent endometrial cancer: analysis of german claims data". En ESGO 2021 Congress. BMJ Publishing Group Ltd, 2021. http://dx.doi.org/10.1136/ijgc-2021-esgo.111.

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Sekachev, Mikhail, Cheng-Xian Lin, Zhiyu Hu y Don Dareing. "A Computational Study of Catalytic Platinum Nanoparticles With and Without OH Chemisorption During Reactions". En ASME 2008 3rd Energy Nanotechnology International Conference collocated with the Heat Transfer, Fluids Engineering, and Energy Sustainability Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/enic2008-53029.

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In this paper, various energies and geometries of pure platinum nanoparticles and those of platinum nanoparticles with adsorbed OH were investigated. Ten different platinum clusters of up to 28 atoms were studied using spin-unrestricted density functional theory (DFT) with a double numerical plus polarization basis set. Three different shapes were presented, and the effect of cluster size on binding energy, total energy, and HOMO-LUMO energy gap was investigated. The same set of calculations was performed for selected clusters with OH adsorbate on the Pt(111) surface. The results show that the stability of both the pure clusters and the clusters with adsorbed OH molecule increases with an increase of cluster size. This fact indicates that direct influence of the size of Pt cluster on the reaction rate is possible, and the understanding of how cluster size would affect binding energy is important. The effect of cluster size on total energy of molecule was shown to be a linear function independent of cluster type, as expected. We also found that optimized (stable) Pt clusters were bigger in size than that of the initial clusters, or clusters with bulk geometry.
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Lu, M. C., H. M. Hsieh, F. G. Tseng y C. C. Chieng. "Molecular Dynamic Simulation of Nano-Sized Channel Flow". En ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33775.

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Liquid flow passes through two parallel plates are simulated using molecular dynamic method. The flowing systems consist of 2744, 5488, and 8232 Argon molecules inside channels with heights of 40Å, 80Å, and 120Å respectively and the liquid Argon is sandwiched between two solid walls. The wall is comprised of fcc <111> surface of 510 platinum molecules. The potentials between argon-argon and argon-platinum are well-known Lennard-Jones functions. The flow behavior is studied by two driven mechanisms: (1) pulling two parallel plates at a constant velocity with zero pressure gradients, and (2) pressure gradient. The phantom molecules are used to mimic the constant temperature boundary. Velocity profiles with slip boundaries and laminar friction constants are calculated to support the validation of continuous theory with appropriate modifications. This study finds that the channel size, driving mechanism and its magnitude are the factors determining slip/non-slip velocity and the laminar friction constant.
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Tokumasu, Takashi y Daigo Ito. "The Dependence of Molecular Motion on the Dissociative Adsorption of H2 on Pt(111)". En ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32590.

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The dependence of molecular motion on the dissociative adsorption mechanism of hydrogen molecule (H2) on platinum (Pt) surface was studied by Molecular Dynamics (MD) method. An interaction between atoms was considered by the Embedded Atom Method (EAM). A potential between an H atom and a Pt atom was determined from results of Density Functional Theory (DFT). Dissociation probabilities of three surface conditions, that is, (1) when the surface temperature is 300 K, (2) when the surface temperature is 0 K with allowing motion of the surface atoms and (3) when the surface temperature is 0 K with prohibiting motion of the surface atoms, were obtained. From results of the simulations, the effect of surface motion on dissociation probability was analyzed as a function of initial energy of the dissociating molecule or the surface conditions. First, it was concluded that the increase in the dissociation probability of the case (3) by the increase in the initial translational energy of H2 molecule is gentle compared with those of the other cases. Additionally, the minimum initial translational energy of H2 molecule of case (3) at which the H2 molecule can dissociate is the smallest among all of three cases. It was found that this is because the range of the dissociation barrier distribution for the case (3) is wider than those for the other cases due to the thermal motion of surface atoms. Moreover, the effect of translational and rotational motion of molecule on the dissociation probability was analyzed. It was concluded that the dissociation probability increases with the increase in the translational energy while it decreases with the increase in the rotational energy when the rotational energy is small.
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Albuquerque, Lucas Montarroyos Vasconcelos de, Tainan de Morais Bispo, Marcelo Ramos Tejo Salgado, Carolina de Souza Vasconcelos y Gabriela Calado Silva. "EVALUATION OF PATHOLOGIC COMPLETE RESPONSE, DISEASE-FREE SURVIVAL, AND GLOBAL SURVIVAL OF PATIENTS WITH BREAST CANCER, TRIPLE-NEGATIVE SUBTYPE, WHO UNDERWENT PLATINUM-BASED NEOADJUVANT CHEMOTHERAPY AT HOSPITAL DE CÂNCER DE PERNAMBUCO IN 2018–2021". En XXIV Congresso Brasileiro de Mastologia. Mastology, 2022. http://dx.doi.org/10.29289/259453942022v32s1006.

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Introduction: Neoadjuvant chemotherapy (NEO CT) plays an important role in the treatment of breast cancer. The main objective of this treatment was to provide better surgical results for patients who were initially considered unresectable or to enable the performance of conservative surgeries for operable patients who, due to tumor size, would be candidates for mastectomy. Besides, NEO therapy works as an in vivo sensitivity test for the applied therapy. Meta-analyses have assessed the role of pathologic complete response (pCR; ypT0/is ypN0) in relation to global survival (GS) and disease-free survival (DFS), with significantly favorable results. Objective: The aim of this study was to assess the pCR in patients with invasive breast cancer, triple-negative (TN) subtype, who underwent platinum-based NEO CT, in order to design a profile of these patients, besides assessing the DFS rate and GS rate. Method: For the description of the study population, the absolute and percentage frequency distribution was represented by mean and standard deviation when the variable presented normal distribution, and by median and interquartile interval. The applied normality test was Kolmogorov-Smirnov. The Kaplan-Meyer graph was used to analyze GS and DFS, in order to describe the survival curves. In the comparison of survival curves, according to the condition of pCR, the log-rank test was used. The analysis was conducted using the STATA software version 14.0. Results: The study was composed of 112 female patients with TN breast cancer who underwent platinum-based NEO CT, with mean age of 44.5 years; 56.2% were aged between 40 and 59 years. Most patients (96.4%) had invasive carcinoma of no special type; 54.5% at histological grade III. As for clinical staging, 33.9% were IIB, whereas 25.0% and 27.7% were IIIA and IIIB, respectively. In all, 92.0% of the patients underwent mastectomy. Almost all patients underwent radiotherapy after surgery (111/112). Only two patients presented with disease progression during CT; 57.1% had pCR; and 44.1% had partial response after NEO CT. Among women with complete response, DFS was 100% in 12 months, and 88.9% in 24 months, whereas for those who did not present pCR, the probability of DFS was 91.30% in 12 months and 78.02% in 24 months. Due to the small number of patients, we could not correlate the pCR rate with DFS and GS. Conclusion: In line with the European meta-analysis published in 2018 (ESMO), our study showed high rates of pCR after platinum-based NEO CT in patients with TN breast cancer. Contrary to data from other studies, this research could not associate pCR with improved DFS and GS.
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Boestaman, Refrizal, V. P. Swaminathan y H. L. Bernstein. "Protective Coatings and Degradation Experiences for First Stage Buckets on GE MS-5002B/C Gas Turbines". En ASME 1996 Turbo Asia Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-ta-032.

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PT Arun operates 21 GE Model MS-5002 B/C gas turbines as mechanical drive with a total power of 514 MW, and a total of 2.7 million hours of accumulated operation. The first generations of simple cycle gas turbines were designed at 1700 F (927 C) firing temperature using first stage buckets design cast from IN-738LC and coated with a conventional 2-phase platinum aluminide coating (Pt-Al). Since 1989, the output power was increased by raising gas turbine firing temperature to 1770 F (965 C). This uprate was implemented by using first stage buckets cast from GTD-111 DS and coated with GT-29 Plus. Metallurgical examination of these coatings at various operating hours have been performed to check their performance and the cause of coating degradation. These results are considered for future coating selection. In the last two years PT Arun has explored a new single phase NiCoCrAlY coating and a single phase Pt-Al diffusion coating using chemical vapor disposition process as an alternate to GT-29 plus coating replacement. Both of these coatings are used at PT Arun and have accumulated 32,400 hours for NiCoCrAlY or GT-33 and 2880 hours for single phase Pt-Al or MDC-150L coating as of June 1996. The information regarding qualification of these alternate coatings (zero running hours) will be discussed in this paper.
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Shibahara, Makoto, Katsuya Fukuda, Qiusheng Liu y Koichi Hata. "Critical Heat Flux for Convective Boiling in Mini-Tube due to Power Transient". En ASME 2017 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/ht2017-5043.

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Critical heat flux (CHF) of convective boiling in a mini-tube due to power transient was measured. A platinum tube with an inner diameter of 1.0 mm was heated exponentially by a direct current power supply as Joule heating. The heated length of the platinum tube was 40.9 mm. The platinum tube was mounted vertically in the water-loop apparatus which consisted of a circulating pump, a pre-heater, a flow mater, a pressurizer, a cooler and a test section. The deionized water was pressurized by the pressurizer up to approximately 800 kPa to measure CHFs at the high subcooling. The upward flow velocity in the platinum tube was ranged from 5 to 11 m/s. The inlet subcooling was ranged from 92 to 117 K. The heat generation rate was controlled with exponential functions. The e-folding time of the heat generation rate was ranged from 30 ms to 18 s. As an experimental result, it was found that the CHFs increased with increasing the flow velocity and the inlet subcooling. The CHF also increased with decreasing the e-folding time of the heat generation rate. Since the heat generation rate of the platinum tube increased rapidly under the power transient condition, it was considered that the heat flux of the platinum tube increased until the vapor blanket covered the heated surface of the platinum tube.
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Informes sobre el tema "Platinum (111)"

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Kim, Yong Joo. The growth of epitaxial iron oxides on platinum (111) as studied by X-ray photoelectron diffraction, scanning tunneling microscopy, and low energy electron diffraction. Office of Scientific and Technical Information (OSTI), mayo de 1995. http://dx.doi.org/10.2172/109505.

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