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Littérature scientifique sur le sujet « Overlayer »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Overlayer"

1

SINGH, RANBER. « MAGNETIC COUPLING IN PSEUDOMORPHIC 2ML OVERLAYERS AND SANDWICH SUPERLATTICE STRUCTURES OF Cr, Mn, Fe, Co AND Ni ON FCC Cu(001) ». International Journal of Modern Physics B 24, n^o 04 (10 février 2010) : 405–12. http://dx.doi.org/10.1142/s0217979210055007.

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The magnetic coupling in pseudomorphic overlayer and sandwich structures of 2ML magnetic ultrathin films on Cu (001) substrate is investigated by using spin-polarized density functional theory. The 2ML magnetic overlayers have significant magnetic moment except CrNi overlayer for which magnetic moment is very small (0.004 μB/ atom ). The overlayers having one layer of Cr turn out to be antiferromagnetically coupled except CrNi/Cu overlayer which has ferromagnetic coupling. All other overlayers have ferromagnetic coupling. In contrast to ferromagnetic MnMn/Cu overlayer, the Cu/MnMn/Cu sandwich has antiferromagnetic coupling. Similar to CrFe/Cu overlayer, the Cu/CrFe/Cu sandwich has antiferromagnetic coupling, while all other sandwiches have ferromagnetic coupling. The sandwiched structures have reduced magnetic moment as compared to their overlayer counterparts. The MnMn , MnFe , and MnCo sandwiches have highly reduced magnetic moment as compared to their overlayer counterparts.

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Pick, Štěpán. « Tailoring the Surface Reactivity : Comparison of Pd/Nb(110) and Rh/Nb(110) ». Collection of Czechoslovak Chemical Communications 73, n^o 6-7 (2008) : 745–54. http://dx.doi.org/10.1135/cccc20080745.

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Ni, Pd and Pt overlayers deposited on many metallic surfaces show properties resembling those of noble metals. We pose the question whether a similar trend might occur also for other transition-metal overlayers. To this goal, we perform first-principles density-functional theory calculations for Pd(111), Rh(111) surfaces, Pd and Rh epitaxial monolayers deposited on Nb(110), and for CO chemisorption on these systems. Density functional calculations indicate that the behavior of the two overlayers is quite different. Whereas the Rh overlayer on Nb(110) resembles the Rh(111) surface, for the Pd overlayer the electronic structure around the Fermi level is strongly affected by hybridization with Nb electrons, which accounts for unique properties of the overlayer. We expect that the latter mechanism may be of importance just for Pd, Pt, Ni and not for other transition metals with lower d-electron occupation.

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WANG, Y. R., J. A. KUBBY et W. J. GREENE. « THIN FILM ELECTRON INTERFEROMETRY ». Modern Physics Letters B 05, n^o 21 (10 septembre 1991) : 1387–405. http://dx.doi.org/10.1142/s0217984991001696.

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Electron transport through thin overlayers of tin grown on a silicon substrate, and stacking-fault contrast in topographic and conductivity images of Si (111) – 7 × 7 are investigated. Resonances that depend on structural integrity of the overlayer are observed in the conductivity images, and are interpreted as consequences of electron standing-wave formation within the overlayer. The experimental spectra are analyzed using a one-dimensional model which has scattering potentials located at the sample surface and at the overlayer-substrate interface. The agreement between experiment and theory demonstrates that electron-standing wave spectra, in conjunction with bias-dependent topographic and conductivity images, are useful for probing details of buried interfaces formed by surface reconstruction and in heteroepitaxial growth.

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Cordill, M. J., N. R. Moody et D. F. Bahr. « Quantifying improvements in adhesion of platinum films on brittle substrates ». Journal of Materials Research 19, n^o 6 (juin 2004) : 1818–25. http://dx.doi.org/10.1557/jmr.2004.0232.

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This study used nanoindentation coupled with stressed overlayers to evaluate the effect of titanium interlayers on the interfacial fracture energy of platinum films on SiO2 substrates. Interfacial fracture energy was calculated three ways: from platinum buckles that formed spontaneously upon deposition of the film, from buckles that formed upon deposition of a stressed tungsten overlayer, and from blisters triggered by indentation of a platinum film with a tungsten stressed overlayer. The calculated values for the interfacial fracture energy of the Pt-SiO2 interface were 0.2 and 0.5 J/m2 for indentation blisters and spontaneous buckles, respectively. The effect of a titanium interlayer on adhesion was examined using a tungsten stressed overlayer coupled with nanoindentation. The addition of a titanium layer improved the adhesion of the platinum film on SiO2 from 0.2 to 1.0 J/m2.

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Song, Jaewon, Hye Ryeong Kim, Jaehoo Park, Seehwa Jeong et Cheol Seong Hwang. « Oxidation Behavior of TiAlN Barrier Layers with and without Thin Metal Overlayers for Memory Capacitor Applications ». Journal of Materials Research 17, n^o 7 (juillet 2002) : 1789–94. http://dx.doi.org/10.1557/jmr.2002.0265.

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The oxidation behavior of sputtered TiAlN thin-film barrier layers was studied by cross-section transmission electron microscopy. Bare 100-nm-thick TiAlN films on SiO2/Si began to oxidize from the surface after annealing in air for 10 min from about 550 °C. Annealing at 700 °C oxidized half of the layer thickness. A 100-nm-thick Pt overlayer on the barrier layer retarded macroscopic oxidation at 650 °C. However, a 10-nm-thick Pt overlayer accelerated oxidation as a result of the catalytic dissociation of O2 molecules to form O atoms, which oxidized the barrier layer at 550 °C to the same extent as without the thin Pt overlayer at 650 °C. The effects of other thin metal overlayers, such as Ru and Ir, were also investigated. Ru and Ir did not accelerate TiAlN oxidation due to the absence of catalytic activity.

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Lindgren, S. Å., et L. Walldén. « Overlayer states ». Surface Science 211-212 (avril 1989) : 394–403. http://dx.doi.org/10.1016/0039-6028(89)90795-4.

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Lindgren, S. Å., et L. Walldén. « Overlayer states ». Surface Science Letters 211-212 (avril 1989) : A124. http://dx.doi.org/10.1016/0167-2584(89)90343-5.

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Kerdja, T., F. Dahmani et D. Ghobrini. « Simple evidence of radiation transport in coated plastic targets ». Laser and Particle Beams 9, n^o 2 (juin 1991) : 563–68. http://dx.doi.org/10.1017/s0263034600003578.

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Planar coated targets of Aluminum and Gold overlayers were irradiated with 1.06-μm laser light at intensities 1011–5 × 1013 W/cm2. The energy penetration depth, the ablated plasma, and the X-ray emission were characterized. Results show significant energy transport through the overlayer.

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DE COSS, R. « ELECTRONIC STRUCTURE OF STRAINED VANADIUM OVERLAYERS ON W(100) AND Ta(100) ». Surface Review and Letters 03, n^o 04 (août 1996) : 1505–9. http://dx.doi.org/10.1142/s0218625x96002503.

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We study the role of hybridization and overlayer–substrate lattice mismatch in determining the surface electronic structure of strained V monolayers and bilayers on W(100) and Ta(100). The local density of states is calculated in the tight-binding approximation within the surface-Green-function-matching formalism. For one monolayer of V on W(100) and Ta(100), the strong monolayer–substrate 3d–5d hybridization determines the features of the surface local density of states, with essentially no differences between 1V/W(100) and 1V/Ta(100). For the bilayer we find that the electronic structure of the topmost layer depends strongly on the lattice mismatch between overlayer and substrate. In particular, we find that the surface local density of states at the Fermi level in 2V/Ta(100) is 69% higher than in 1V/Ta(100); the lattice mismatch between bulk constants of V and Ta is 9.0%. These results indicate that strain induces strong band narrowing in vanadium overlayers on transition metals, despite the large overlayer–substrate hybridization, but depends critically on the film thickness.

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Li, Haobo, Jianping Xiao, Qiang Fu et Xinhe Bao. « Confined catalysis under two-dimensional materials ». Proceedings of the National Academy of Sciences 114, n^o 23 (22 mai 2017) : 5930–34. http://dx.doi.org/10.1073/pnas.1701280114.

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Confined microenvironments formed in heterogeneous catalysts have recently been recognized as equally important as catalytically active sites. Understanding the fundamentals of confined catalysis has become an important topic in heterogeneous catalysis. Well-defined 2D space between a catalyst surface and a 2D material overlayer provides an ideal microenvironment to explore the confined catalysis experimentally and theoretically. Using density functional theory calculations, we reveal that adsorption of atoms and molecules on a Pt(111) surface always has been weakened under monolayer graphene, which is attributed to the geometric constraint and confinement field in the 2D space between the graphene overlayer and the Pt(111) surface. A similar result has been found on Pt(110) and Pt(100) surfaces covered with graphene. The microenvironment created by coating a catalyst surface with 2D material overlayer can be used to modulate surface reactivity, which has been illustrated by optimizing oxygen reduction reaction activity on Pt(111) covered by various 2D materials. We demonstrate a concept of confined catalysis under 2D cover based on a weak van der Waals interaction between 2D material overlayers and underlying catalyst surfaces.

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Thèses sur le sujet "Overlayer"

1

Roudgar, Ataollah. « Local reactivity of bimetallic overlayer and cluster systems ». [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=971640084.

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Barnes, Robert David Frazer. « Diffraction gratings as a platform for overlayer detection and representation ». Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319553.

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Clarke, A. « A wavevector imaging photoelectron spectrometer, with application to a magnetic overlayer system ». Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233729.

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The work presented in this thesis may be considered in two main parts; firstly a description of the design and operation of a display type photoelectron spectrometer. Secondly a series of experiments investigating the electronic properties of thin epitaxial films (1-5 atomic layers) of cobalt grown on a clean single crystal copper (001) substrate. Conventional angle resolved photoelectron spectrometers of the deflection type are only capable of observing one point in the (E,θ,φ) space at a time. This is often perfectly acceptable if one is concerned with optimal resolution in order to perform accurate band mapping experiments. However certain experiments are essentially impossible, for instance the observation of the emitted photocurrent over all θ,φ at the fermi energy. This is partly because of the time limitations imposed by the necessity to keep the sample atomically clean in the U.H.V. environment. Several previous workers have tackled this problem by designing spectrometers that observe large sections of θ,φ space simultaneously, for a given energy. The first part of this work concerns the design and implementation of a display type spectrometer which embodies some new and quite novel features. Thin epitaxial films of ferromagnetic materials grown on non-magnetic substrates have long been of interest. Partly as a prototypical surface for the investigation of surface magnetism, and partly for the investigation of the changes induced in the magnetic properties as the dimensionality is reduced or as the lattice size is changed. The second part of this thesis concerns experiments using three different spectroscopies on a system of this type, specifically Co on Cu(001). Firstly, a photoemission study using the display spectrometer is presented, observations of the spin-split bands as a function of wavevector parallel to the surface are shown. Secondly an Auger electron study of the growth mode of the epitaxial film, together with a LEED I/V study of the changing lattice strain as a function of film thickness are presented. Although none of these measurements directly probe the magnetism of the films, they provide very necessary information in order to understand their behaviour.

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Anton, Alan Brad Weinberg Henry. « Studies of overlayer vibrational structure and identification of adsorbed reaction intermediates via electron energy loss spectroscopy / ». Diss., Pasadena, Calif. : California Institute of Technology, 1986. http://resolver.caltech.edu/CaltechETD:etd-04032008-110807.

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MORANDI, SARA. « NEW APPROACHES FOR THE DESIGN, SCREENING AND CHARACTERIZATION OF INNOVATIVE SEMICONDUCTOR/OVERLAYER ARCHITECTURES FOR PHOTO-DRIVEN WATER ELECTROLYSIS ». Doctoral thesis, Università degli Studi di Milano, 2017. http://hdl.handle.net/2434/484308.

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New approaches for the design, screening and characterization of innovative semiconductor/overlayer architectures for photo-driven water electrolysis The optimization of environmental protection and remediation and the better exploitation of renewable power sources undoubtedly represent the key issues to lead to the sustainable development of civil and industrial activities. In this context, hydrogen and electricity can be considered as the most promising and as the most adopted energy vector, respectively. The possibility of adopting the former depends on the availability of suitable devices to convert renewable energy into chemical energy. Here, the production of H2 from sunlight, by photoelectrochemical water splitting (PEC-WS), represents one of the most attractive processes giving the possibility of a direct use of sunlight to drive water splitting into molecular hydrogen and oxygen. Notwithstanding the strong interest for PEC‐WS, its development on an industrial scale is hindered by the high costs of core materials and their inadequate efficiency and/or stability. In the last years, a lot of effort has been devoted to the study of different semiconductor/electrocatalyst combinations. In particular, recent studies highlighted the ability of electrocatalyst overlayers of inducing modifications in the semiconductor electron density [1] or of storing the photogenerated holes, thus decreasing the probability of charge recombination [2,3]. This greatly extends the possible candidates for photoelectrocatalysts and requires new efficient screening methods. In this context, scanning electrochemical microscopy (SECM) is an optimal tool for the rapid screening of big libraries of materials [4-8]. In this Ph.D. thesis, innovative approaches for the study of different photoanode architectures are discussed. In the first part, preliminary results of promising OER electrocatalysts deposited onto Ti sheets are shown. The electrocatalytic activity of the different spots has been studied by SECM using a substrate generation/tip collection (SG-TC) approach, according to which the substrate spots generate molecular oxygen that is reduced at the tip. Since the spots generate O2 all together, the attention was also focused on the application of the double pulse method [9] that allows to address and compare each spot’s activity. The most performing electrocatalysts were then deposited onto a photoconverter (n-doped semiconductor), to study the photo-electrochemical behaviour of the so-obtained semiconductor/overlayer architecture. The semiconductor chosen for its low-cost, stability and favourable band position was hematite (α-Fe2O3), in the form of nanowires [10]. Various low-cost metal oxides were then deposited onto the same photoconverter layer and screened via SECM, by the double pulse method and under white light irradiation (by means of an optical fibre probe, able to move over the sample under investigation). Considering that the average spot size is of 500 µm, the spot-spot distance (centre-to-centre) is set at 800 µm and the fibre diameter is 200 µm, we can assume that the local illumination addresses only one spot at time during the screening. The SECM rapid evaluation was aimed to select the best semiconductor/overlayer combinations that were then synthesized on lab-scale photoelectrodes and tested with conventional photoelectrochemical characterization methods (CV, EIS, etc.). As already mentioned, screening of catalysts mostly involve the adoption of generation/collection modes of SECM that use the tip to locally produce one of the reactants or to locally sense the reaction products. Unfortunately, the materials available in the form of microwires useful to produce tips are limited to a short list of metals. For this reason, another part of this thesis was focused on the preparation, characterization and use of cavity-microelectrodes (C-ME) as tips for the SECM [11]. These C-ME tips [12-14] can be filled with a desired finely dispersed material and used as conventional microdisk tip in several SECM configurations. A third part of the thesis is devoted to the study of stability and performances of different semiconductors, appositely synthesised in the form of amorphous nanoparticles through a different and innovative method. This work was performed during a stay at Professor Joaquin Rodriguez-Lopez laboratories, University of Illinois at Urbana-Champaign (UIUC). The semiconductors under investigation were TiO2, WO3 and BiVO4. These materials were tested at the SECM under white light irradiation, and different conditions were applied to enhance the material photoactivity (Nafion® addition, etc.). The last part of this thesis discusses the role of different materials for the water oxidation, both deposited onto inert electrodes or semiconductors, using innovative in-situ and operando X-ray absorption (XAS) techniques. These techniques are particularly interesting when combined with electrochemistry, being able to provide information about the oxidation state and surrounding atoms. The techniques were initially applied to conventional, “model” catalysts, like amorphous iridium oxides [15,16] or Pt nanoparticles, and can be in principle extended towards any desired electrochemical or photoelectrochemical system. [1] M. Barroso, C.A. Mesa, S.R. Pendlebury, A.J. Cowana, T. Hisatomi, K. Sivula, M. Grätzel, D.R. Klug, J.R. Durrant, PNAS, 109, (2012), 15640-15645. [2] L. Badia-Bou, E. Mas-Marza, P. Rodenas, E.M. Barea, F. Fabregat-Santiago, S. Gimenez, E. Peris, J. Bisquert, J. Phys. Chem. C, 117, (2013), 3826-3833. [3] F. Lin, S.W. Boettcher, Nature Materials, 13, (2014), 81-86. [4] J.L. Fernández, D.A. Walsh, A.J. Bard, J. Am. Chem. Soc., 127, (2005), 357-365. [5] A. Minguzzi, M.A. Alpuche-Aviles, J. Rodríguez-López, S. Rondinini, A.J. Bard, Anal. Chem., 80, (2008), ,4055-4064. [6] J. Lee, H. Ye, S. Pan, A.J. Bard, Anal. Chem., 80, (2008), 7445-7450. [7] H. Ye, H. S. Park, A. J. Bard, J. Phys. Chem. C., 115, (2011), 12464-12470 [8] D. Yuan, L. Xiao, J. Jia, J. Zhang, L. Han, P. Li, B. Mao, D. Zhan, Anal. Chem., 86, (2014), 11972-11976 [9] A. Minguzzi, D. Battistel, J. RodrÍguez-López, A. Vertova, S. Rondinini, A. J. Bard, S. Daniele, J. Phys. Chem. C, 119, (2015), 2941-2947 [10] F. Malara, A. Minguzzi, M. Marelli, S. Morandi, R. Psaro, V. Dal Santo, A. Naldoni, ACS Catalysis, 5, (2015), 5292-5300. [11] S. Morandi, A. Minguzzi, Electrochemistry Commumications, 59, (2015), 100-103. [12] C. Locatelli, A. Miguzzi, A. Vertova, P. Cava, S. Rondinini, Anal. Chem., 83, (2011), 2819-2823 [13] A. Minguzzi, C. Locatelli, G. Cappelletti, C. L. Bianchi, A. Vertova, S. Ardizzone, S. Rondinini, J. Mater. Chem., 22, (2012), 8896-8902 [14] A. Minguzzi, C. Locatelli, O. Lugaresi, A. Vertova, S. Rondinini, Electrochim. Acta, 114, (2013), 637-642 [15] T. Baran, M. Fracchia, A. Vertova, E. Achilli, A. Naldoni, F. Malara, G. Rossi, S. Rondinini, P. Ghigna, A. Minguzzi, F. D’Acapito, Electrochimica Acta, 207, (2016), 16–21 [16] S. Rondinini, A. Minguzzi, E. Achilli, C. Locatelli, G. Agostini, S. Pascarelli, G. Spinolo, A. Vertova, P. Ghigna, Electrochimica Acta, 212, (2016), 247–253

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Andreussi, Oliviero. « Water at Interfaces ». Doctoral thesis, Scuola Normale Superiore, 2008. http://hdl.handle.net/11384/85793.

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Law, Yeuk Ting. « Investigation of reaction networks and active sites in ethanol steam reforming reaction over Ni and Co-based catalysts ». Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-00869963.

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Bimetallic catalysts have been widely exploited to improve the performance of various catalytic reactions. Understanding the surface properties and in particular, bimetallic interaction and support effect of the catalytic components is an important step towards rational catalyst design. In this thesis, Ni-Co thin film on polar ZnO single crystal was studied as a model catalyst for ethanol steam reforming reaction. The aim is to provide fundamental understanding of how the surface characteristics of the catalyst influence the mechanism and the efficiency of the reaction. This study focused firstly on the study of the interaction between Ni and Co in oxidative environment using Xray photoelectron spectroscopy (PES). Oxidation of Co is favoured over nickel and the surface is enriched with cobalt oxide. Secondly, Ni-Co thin film supported on polar Zn and O terminated ZnOwas studied by synchrotron based PES. The as deposited layer interacts readily with ZnO and Co is partially oxidized upon deposition, even at room temperature. The interaction of ethanol with Ni- Co/ZnO-Zn was studied by thermal desorption spectroscopy (TDS). Ethanol decomposes in different pathways on Ni and Co, in which C-C bond scission and methane production are favoured on Ni/ZnO-Zn while dehydrogenation is favoured on Co/ZnO-Zn. Finally, Ni-Co powder was studied byin-situ ambient pressure PES under reaction conditions in order to clarify the correspondence between the active state of the catalyst and the reaction activity. The product selectivity on Co catalyst is distinctly different from Ni and Ni-Co. Also, the decomposition of methyl group and the high amount of CO produced over Co is likely to be the cause for its high level of carbon deposition.

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ACHILLI, SIMONA. « Spectral properties of adsorbates on metal surfaces via the embedding method ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2010. http://hdl.handle.net/10281/10827.

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Adsorbates on metal surfaces have attracted recently the scientific interest both from a fundamental point of view (quantum confinement) and in perspective of application in technology. In particular the electronic properties of such reduced symmetry systems are strictly related to their low dimensionality. An accurate theoretical description of their spectral properties has necessarily to deal with the absence of periodicity that characterizes these systems in one (thin films) or more (adatoms) directions. The embedding method allows to overcome this drawback considering a really infinite system both on vacuum and bulk side. In this thesis the ab initio spectral properties of single adatoms (alkali-metal atom and Ba) on Cu(111) and thin overlayers (K/Cu(111), Bi/Cu(100), O/Fe(100)) are analyzed, also in comparison with experimental results. The capabilities of the theoretical method adopted allow to evidence the role of the substrate band structure on the adsorbates induced electronic states. In particular the aspects related to the resonant charge transfer from the adsorbate's states to the bulk continuum are analyzed. This process represents an elastic decay channel for the surface electronic states and contributes to the elastic lifetime, that we can estimate according to the description of a continuous substrate band structure. The results presented for single adatoms evidence the blockade effect that a surface projected energy gap of the substrate produces on the resonant charge transfer. On the other hand the results relative to the overlayer allows to analyze the complex hybridization mechanism between surface features and substrate states in different points of the surface Brillouin zone. In addition the theoretical description of the electronic properties of overlayers on metal surfaces is devoted in this thesis also to the simulation of experimental findings, namely STM and STS images and photoemission spectra, showing the predictive character of the theoretical approach used.

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Gerth, Christopher Marc. « Infrared absorption studies of two different types of self-assembled monolayers : alkanethiols deposited from aqueous solution and surface confined polymerization of polymethyl-methacrylate (PMMA) using metal overlayer attenuated total reflectance (ATR) and single bounce germanium attenuated total reflectance (GATR) spectroscopies / ». For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.

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Amft, Tobias Verfasser], Kálmán [Gutachter] Graffi et Martin [Gutachter] [Mauve. « The Impact of Resource Sharing on Coexisting P2P Overlays and Stacked Overlay Modules / Tobias Amft ; Gutachter : Kalman Graffi, Martin Mauve ». Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2017. http://d-nb.info/1148066845/34.

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Livres sur le sujet "Overlayer"

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Faulkner, I. Surface science of metal/overlayer systems for biosensors and self-assembled layers. Manchester : UMIST, 1994.

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Collins, Suzanne. Gregor the Overlander. New York : Scholastic Press, 2003.

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Collins, Suzanne. Gregor the Overlander. Waterville, Me : Thorndike Press, 2005.

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Collins, Suzanne. Gregor the Overlander. New York : Scholastic Press, 2003.

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Norton, Floyd L. Overlay test. Chestnut Hill, MA : Boston College Press, 2000.

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Maas, Tim. Overlay Handicapping. Herlong, California, USA : Overlay Publications, 1997.

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Conventional whitetopping overlays. Washington, D.C.] : U.S. Dept. of Transportation, Federal Highway Administration, 2002.

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Ceelan, Will. Structure and morphology of thin metallic overlayers. Eindhoven : Eindhoven University, 1997.

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Watson, Donald E., et Michael Heitzman. Thin Asphalt Concrete Overlays. Washington, D.C. : Transportation Research Board, 2014. http://dx.doi.org/10.17226/22337.

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LaFraugh, Robert W. Concrete overlays for bridges. [Olympia, WA] (Highway Administration Bldg., Olympia 98504) : Washington State Dept. of Transportation in cooperation with U.S. Dept. of Transportation, Federal Highway Administration, 1986.

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Chapitres de livres sur le sujet "Overlayer"

1

Wang, G. C., J. K. Zuo et T. M. Lu. « Kinetics of Overlayer Growth ». Dans NATO ASI Series, 455–70. Boston, MA : Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-5970-8_24.

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Weaver, J. H. « Overlayer Formation on High-Temperature Superconductors ». Dans Interfaces in High-Tc Superconducting Systems, 210–35. New York, NY : Springer New York, 1994. http://dx.doi.org/10.1007/978-1-4612-2584-3_7.

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Laubschat, C., M. Prietsch, M. Domke, E. Weschke, T. Mandel, G. Remmers, J. E. Ortega, C. Xue et G. Kaindl. « Influence of Overlayer Metallization on Schottky-Barrier Formation ». Dans NATO ASI Series, 425–38. Boston, MA : Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0795-2_27.

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Tsukada, M., N. Shima, Z. Zhu, H. Ishida et K. Terakura. « Electronic Structure and Excitations of Metal Overlayer on Semiconductor Surfaces ». Dans NATO ASI Series, 351–66. Boston, MA : Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0795-2_23.

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Draper, Charles F., David M. Schaefer, Richard J. Colton et Steven M. Hues. « Effect of Overlayer Thickness on the Nanoindentation of SiO2 /Si ». Dans Forces in Scanning Probe Methods, 85–90. Dordrecht : Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0049-6_7.

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Rubin, James B., Craig M. V. Taylor, Patricia Paviet-Hartmann et Thomas Hartmann. « Ash Cements Stabilized by Supercritical Co2 Carbonation for Tailings Pond Overlayer ». Dans Turning a Problem into a Resource : Remediation and Waste Management at the Sillamäe Site, Estonia, 253–63. Dordrecht : Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4092-8_31.

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Whitman, L. J., Joseph A. Stroscio, R. A. Dragoset et R. J. Celotta. « Alkali Metals on III-V (110) Semiconductor Surfaces : Overlayer Properties and Manipulation Via STM ». Dans Atomic and Nanometer-Scale Modification of Materials : Fundamentals and Applications, 25–35. Dordrecht : Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-2024-1_3.

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Eguiluz, A. G., et J. A. Gaspar. « Dynamical Response of an Overlayer of Alkali-Metal Atoms Adsorbed on a Free-Electron Metal Surface ». Dans Springer Proceedings in Physics, 23–35. Berlin, Heidelberg : Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-76376-2_4.

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Johnson, A. D. « The Initial Stages of Overlayer Growth Studied Using High Energy Electron Forward Scattering : Cr/Ag(100) ». Dans Physics, Fabrication, and Applications of Multilayered Structures, 343. Boston, MA : Springer US, 1988. http://dx.doi.org/10.1007/978-1-4757-0091-6_19.

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Furukawa, S. « Overlayers ». Dans Springer Proceedings in Physics, 83–93. Berlin, Heidelberg : Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-71446-7_7.

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Actes de conférences sur le sujet "Overlayer"

1

Deeter, Merritt N., et Dror Sarid. « Determination of Optical Constants by Angle-Scanning Reflectometry ». Dans Optical Interference Coatings. Washington, D.C. : Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oic.1988.wc6.

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Accurate characterization of optical constants of metal films is often prevented by unwanted overlayers which may be due to oxidation, surface roughness, or other causes1. These overlayers in general have different optical characteristics than the underlying metal film and thus can significantly alter the optical measurements (e.g. reflectance or ellipsometry) made on the sample. Ignoring these overlayers generally leads to inaccurate estimates of the actual optical constants of the metal. To avoid this problem, the overlayer must either be eliminated or included as part of the theoretical model. Unfortunately, inclusion of the overlayer in the model introduces more unknowns to be determined, and makes data analysis considerably more complicated. A more simple approach, which we employ, is to make the optical measurements through the (transparent) substrate. In this case, the radiation interacts only with the unexposed portion of the metal film (assuming the film is sufficiently thick) and hence surface oxide or roughness layers do not affect the optical measurements.

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Sabino, M., S. Lim et M. Tran. « Effect of overlayer material and thickness in Ta/CoFeB/MgO/overlayer structures ». Dans 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7157509.

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Chuang, Wei-Ching, Jin-Shin Lin, Kun-Yi Lee et Wei-Yu Lee. « Polymer waveguide switch using liquid-crystal overlayer ». Dans Optoelectronics and High-Power Lasers & Applications, sous la direction de Bernard Kippelen et Donal D. C. Bradley. SPIE, 1998. http://dx.doi.org/10.1117/12.305435.

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Scimeca, T., Y. Watanabe, F. Maeda et M. Oshima. « Metal Overlayer Deposition on Se/GaAs(100) ». Dans 1993 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 1993. http://dx.doi.org/10.7567/ssdm.1993.pd-3-6.

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Kash, Kathleen, J. M. Worlock, Derek D. Mahoney, A. S. Gozdz, B. P. Van Der Gaag, J. P. Harbison, P. S. D. Lin et L. T. Florez. « Optical properties of strain-confinement-defined quantum wires and dots ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.mb1.

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One may strongly modify the linear and nonlinear optical properties of semiconductor materials by quantum confinement of carriers to wires or dots. We describe a new method for achieving this confinement, based on inhomogeneous strain, that applies to a wide variety of semiconductors. We deposit a compressively stressed overlayer onto a semiconductor substrate that contains, for example, an epitaxial layer, or a quantum well. The stressed overlayer is then patterned and etched into arrays of wires and dots. The inhomogeneous strain pattern thus produced in the substrate lowers the bandgap under the center of the wire or dot, creating both lateral and vertical electron, and exciton, confinement. For example, we have patterned strain in a GaAs epitaxial layer by etching a compressed diamondlike carbon overlayer into dots and wires of 100-400 nm in width. Potential wells for excitons in those structures, shown in photoluminescence red shifts, are >50 MeV, with electron zeropoint energies of up to 4 MeV for the smaller structures. We compare our photoluminescence, excitation spectroscopy, and photoluminescence decay time measurements for a variety of strain-confining structures with band structure theory based on finite-element calculations of the strain patterns.

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ŻYMIERSKA, D., J. AULEYTNER, J. DOMAGAŁA, S. MIOTKOWSKA, N. DMITRUK, I. DMITRUK et M. PAWŁOWSKA. « SURFACE ROUGHNESS OF Si CRYSTALS WITH SiO2 OVERLAYER ». Dans Proceedings of the XVIII Conference. WORLD SCIENTIFIC, 2001. http://dx.doi.org/10.1142/9789812811325_0046.

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Konstantaki, Maria, Stavros Pissadakis, Nikolaos Vainos, Stelios Couris, Emmanuel Paspalakis, Ioannis Koutselas et Stavros Pissadakis. « Optical fibre long period gratings with a photochromic overlayer ». Dans INTERNATIONAL COMMISSION FOR OPTICS TOPICAL MEETING ON EMERGING TRENDS AND NOVEL MATERIALS IN PHOTONICS. AIP, 2010. http://dx.doi.org/10.1063/1.3521370.

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Jain, Vishal, N. Lakshmi, Vivek Kumar Jain, Sijo A. K et K. Venugopalan. « First principle calculation in FeCo overlayer on GaAs substrate ». Dans NANOFORUM 2014. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4917917.

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Zhu, Eric Y., Maria C. Charles, Cory Rewcastle, Raanan Gad, Li Qian et Ofer Levi. « Sensitizing an all-optical ultrasound sensor with a polymer overlayer ». Dans CLEO : Applications and Technology. Washington, D.C. : OSA, 2020. http://dx.doi.org/10.1364/cleo_at.2020.ath4k.2.

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Spisak, D., et J. Hafner. « Structural and magnetic properties of manganese overlayer on Fe(100) ». Dans INTERMAG 2006 - IEEE International Magnetics Conference. IEEE, 2006. http://dx.doi.org/10.1109/intmag.2006.375661.

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Rapports d'organisations sur le sujet "Overlayer"

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Unertl, W. N., M. Grunze et D. Frankel. Overlayer Adhesion and Passivation of Electronic Materials. Fort Belvoir, VA : Defense Technical Information Center, juillet 1992. http://dx.doi.org/10.21236/ada254783.

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Wu, R., et A. J. Freeman. Metal-ceramic interfaces : Overlayer-induced reconstruction and magnetism of 4d transition-metal monolayers. Office of Scientific and Technical Information (OSTI), février 1995. http://dx.doi.org/10.2172/69417.

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Yala, S., et P. A. Montano. HRLEED and STM study of misoriented Si(100) with and without a Te overlayer. Office of Scientific and Technical Information (OSTI), décembre 1996. http://dx.doi.org/10.2172/432991.

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Lane, Lerose, R. Gary Hicks, DingXin Cheng et Erik Updyke. Manual for Thin Asphalt Overlays. Mineta Transportation Institute, octobre 2020. http://dx.doi.org/10.31979/mti.2020.1906.

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This manual presents best practices on project selection, mix design, and construction to ensure a superior product when constructing thin asphalt overlays. Experience shows these treatments provide excellent performance when placed on pavements in fair to good condition using proper construction techniques. Though sometime referred to by other names, thin asphalt overlays have been widely used for pavement preservation throughout the world for over 50 years. Limited infrastructure funding at the local, state, and federal levels has resulted in greater emphasis on the use of pavement preservation techniques to extend pavement life and reduce maintenance costs. Thin asphalt overlays are one of many preventative maintenance treatments. Thin asphalt overlays are placed directly on existing pavement and can range from 1/2 inch to 1 1/2 inches in thickness. Thin asphalt overlays have proven to be an economical means for maintaining and improving the functional condition of an existing pavement since the 1960s. Specifically, this manual provides guidance for engineers regarding where and when to use thin asphalt overlays including: (1) Types and variations of thin overlays; (2) Materials and the design process; (3) Construction; (4) Quality Assurance; and (5) Troubleshooting. This chapter by chapter guidance enables an Agency’s engineers to design and construct a successful thin asphalt overlay project to completion. This manual is one of four new manuals prepared by the California Pavement Preservation Center (CP2Center) using funding from California Senate Bill 1 (SB-1), passed in April 2017. The other three manuals provide detailed design and construction information for (1) chip seals, (2) slurry surfacing, and (3) Cape seals. The creation of these manuals was a task funded entirely from SB-1 monies for the purpose of disseminating training and technical information on highway pavement preservation to local agencies throughout California.

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DeSantis, John, et Jeffery Roesler. Performance Evaluation of Stabilized Support Layers for Concrete Pavements. Illinois Center for Transportation, février 2022. http://dx.doi.org/10.36501/0197-9191/22-003.

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A research investigation was conducted on the erosion potential of stabilized subbases under concrete pavements and asphalt layers supporting concrete overlays. Through field surveys and testing in Illinois, this project evaluated if existing concrete pavements with stabilized subbases and concrete overlays were exhibiting potential erosion of the underlying support layer. The field evaluation testing included falling weight deflectometer testing, distress surveys, coring, and ultrasonic tomography scanning. A laboratory performance test was also established using the Hamburg wheel-tracking device to assess the erodibility of the various stabilized subbase layers for new construction and existing asphalt layers available for a concrete overlay. The analyzed field test results were coupled together with the laboratory performance testing to provide recommendations for updating the Illinois Department of Transportation’s “Bureau of Design and Environment Manual” guidance. No changes were recommended for hot-mix asphalt stabilized subbases, but testing using the Hamburg wheel-tracking device should be considered for Portland cement concrete stabilized support layers (e.g., CAM II) under concrete pavements. For testing of asphalt support layers for concrete pavement overlays, the Hamburg wheel-tracking device is recommended with performance criteria similar to flexible pavements for appropriate functional classes.

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Doniach, S., et I. Lindau. Physics of Metal Overlayers on Semiconductors. Fort Belvoir, VA : Defense Technical Information Center, mai 1988. http://dx.doi.org/10.21236/ada196471.

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Zhang, Z., J. H. Cho, Q. Niu, C. K. Shih et Z. Suo. ``Electric growth`` of metal overlayers on semiconductor substrates. Office of Scientific and Technical Information (OSTI), février 1998. http://dx.doi.org/10.2172/676875.

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Keromytis, Angelos D., Vishal Misra et Dan Rubenstein. Secure Overlay Services (SOS). Fort Belvoir, VA : Defense Technical Information Center, août 2004. http://dx.doi.org/10.21236/ada426757.

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Risko, Theodore F. Source Code Overlay Editor. Fort Belvoir, VA : Defense Technical Information Center, février 2000. http://dx.doi.org/10.21236/ada375811.

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Skinner, H. B., et R. A. Tuck. The Effect of Metal Overlayers of Thermionic Dispenser Cathodes. Fort Belvoir, VA : Defense Technical Information Center, mars 1985. http://dx.doi.org/10.21236/ada154795.

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