Gotowe bibliografie tematyczne / Film roughness

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Gotowa bibliografia na temat „Film roughness”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 12 lutego 2022

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Artykuły w czasopismach na temat "Film roughness"

He, Li Jun, Chuan Li i Xing Zhao Liu. "Surface Roughness in Alumina Thin Film Deposited on Silica Using Oblique Incidence". Materials Science Forum 787 (kwiecień 2014): 373–77. http://dx.doi.org/10.4028/www.scientific.net/msf.787.373.

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The main characteristics of a surface are physical and chemical structure, surface tension and surface roughness. Surface roughness is one of the critical factors, which could cause instability in quality performance. In this paper, surface roughness of alumina thin films deposited on a silicon substrate by using electron beam evaporation with oblique angle deposition were studied. It has been found that the surface roughness of the alumina thin films was dependent on the substrate temperature, the deposition rate, the film thickness and the inclined angle. The experimental results showed that increasing the substrate temperature reduced the surface roughness at a low inclined angle and enhanced the surface roughness at a high inclined angle, and the surface roughness increased with increasing deposition rate and film thickness. By choosing the appropriate film preparation parameters, the film surface roughness was effectively controlled.

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ZHAO, PEI, RENG WANG, DINGQUAN LIU, FENGSHAN ZHANG, WEITAO SU i XIAOFENG XU. "UNDERLAYER ROUGHNESS INFLUENCE ON THE PROPERTIES OF Ag THIN FILM". Surface Review and Letters 15, nr 06 (grudzień 2008): 787–91. http://dx.doi.org/10.1142/s0218625x08012062.

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The effects of the roughness of ZnS underlayer on the microstructure, optical, and electrical properties of nanometer Ag thin film have been investigated in this paper. Nanometer Ag thin films in glass/ ZnS /7.5 nm Ag /30 nm ZnS stacks have been deposited and analyzed. In the stacks, the underlayers of ZnS have been sputtered with various thicknesses to generate various surface roughnesses. The X-ray diffraction (XRD) has been used to study the crystal structure of Ag films. The surface topography and the roughness of ZnS underlayer have been analyzed by atomic force microscopy. The sheet resistant will become larger as the increasing of the roughness. The optical constants can be derived by fitting the transmission and reflectance spectrum. From optical constants comparison of Ag films, with the surface of the stack becoming rougher, it was found that the refractive index will increase but the extinction coefficient will decrease.

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Chengwei, Wu. "On Mixed Squeeze Films of Infinite Width Plates". Journal of Tribology 113, nr 2 (1.04.1991): 378–83. http://dx.doi.org/10.1115/1.2920632.

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A mixed squeeze film model between two rough squeezing plates is established in the present paper. The squeeze behavior in the presence of full and partial fluid film between two rough surfaces is analyzed by using Patir and Cheng’s average flow model and Greenwood and Tripp’s roughness contact model. For one-dimensional squeeze films, transverse and isotropic surface roughness (γ ≤ 1) leads to an increasing squeeze film damping coefficient and a longer sinkage time in comparison with smooth surfaces. But, longitudinal roughness (γ > 1) leads to a decreasing squeeze film damping coefficient and a shorter sinkage time. When the roughness orientation parameter γ is kept constant, increasing roughness amplitude causes an early roughness contact and an increasing contact rigidity.

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Mitsuya, Y., T. Ohkubo i H. Ota. "Averaged Reynolds Equation Extended to Gas Lubrication Possessing Surface Roughness in the Slip Flow Regime: Approximate Method and Confirmation Experiments". Journal of Tribology 111, nr 3 (1.07.1989): 495–503. http://dx.doi.org/10.1115/1.3261957.

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The average film thickness theory is extended to gas lubrication possessing surface roughness in the slip flow regime. A simplified averaged Reynolds equation is derived and its applicability is confirmed through comparing with experiments. This averaging equation makes use of the mixed average film thickness defined as Havem = αHm + (1 − α)Hmˆ, where m = 1, 2 and 3; α indicates the mixing ratio; and H¯ and Hˆ denote the arithmetically and harmonically averaged film thicknesses. The experiments were performed using computer flying heads having precisely photolithography-fabricated longitudinal, transverse or checkered pattern roughnesses under submicron spacing conditions. From the excellent agreement obtained between the calculated and experimental results, it can be concluded that the assumption that velocity slippage occurs along the surface even if roughnes is present is justified, and that the approximate method is applicable for determining the surface roughness effects in the slip flow regime.

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Wongkaew, Akkarat, Chanida Soontornkallapaki, Naritsara Amhae i Wichet Lamai. "Effect of ZnO on a Superhydrophilic Self-Cleaning Properties of TiO₂/SiO₂ Thin Film on Glass Slide Substrate". Advanced Materials Research 1131 (grudzień 2015): 237–41. http://dx.doi.org/10.4028/www.scientific.net/amr.1131.237.

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This work aims to study the effect of ZnO containing in TiO2/SiO2 film on the superhydrophilic property after exposed to different types of light. The metal solutions were prepared by sol-gel technique and the film was deposited on glass slides by dip coating method. The parameter studied was the amount of ZnO in the TiO2/SiO2 film. The contents of ZnO were 5-20% weight (increased by 5%). The amount of TiO2 was constant at 30% weight. The obtained films were analyzed for their roughness. The results indicated that film roughness changed according to the ZnO contents. With 5%ZnO in the thin film, the roughness was 0.726 nm while 20%ZnO obtained the roughness of 2.128 nm. UV-Vis spectrophotometer was used for measuring of transmittance of films. At wavelength of 550 nm, the transmittances of each film were greater than 90%. Band gap energy of each film was calculated from the transmittance data. It was found that the average band gap energy of the films was 2.47 eV. Then, the films contained various amount of ZnO were grouped into 2 sets. The first set was exposed to visible light while the other set was exposed to UV. The duration of exposure was 5 hr. Both sets of films after exposed to any light were kept in a black box controlled relative humidity of 85%. Each film was measured contact angle every day. It was found that the 30%TiO2/5%Zn/SiO2 film exposed to visible light showed the best superhydrophilic property. The contact angle was about 0-5° within 3 days. This may due to the reduction of band gap energy in the presence of ZnO in TiO2/SiO2 films to 2.41 eV and the roughness of the film.

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Niesen, T. P., M. R. De Guire, J. Bill, F. Aldinger, M. Rühle, A. Fischer, F. C. Jentoft i R. Schlögl. "Atomic force microscopic studies of oxide thin films on organic self-assembled monolayers". Journal of Materials Research 14, nr 6 (czerwiec 1999): 2464–75. http://dx.doi.org/10.1557/jmr.1999.0331.

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The surface morphology of TiO2- and ZrO2-based thin films, deposited from aqueous solution at 70–80 °C onto functionalized organic self-assembled monolayers (SAMs) on silicon has been examined using atomic force microscopy (AFM). The films have been previously shown to consist, respectively, of nanocrystalline TiO2 (anatase) and of nanocrystalline tetragonal ZrO2 with amorphous basic zirconium sulfate. The films exhibit characteristic surface roughnesses on two length scales. Roughness on the nanometer scale appears to be dictated by the size of the crystallites in the film. Roughness on the micron scale is postulated to be related to several factors, including the topography of the SAM and the effects of larger, physisorbed particles or agglomerates. The topographies of the oxide thin films, on both the nanometer and micron scales, are consistent with a particle-attachment mechanism of film growth.

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Mitsuya, Y., i H. Ota. "Stiffness and Damping of Compressible Lubricating Films Between Computer Flying Heads and Textured Media: Perturbation Analysis Using the Finite Element Method". Journal of Tribology 113, nr 4 (1.10.1991): 819–27. http://dx.doi.org/10.1115/1.2920698.

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Averaged static and dynamic lubrication equations are derived in the general form containing anisotropic film thicknesses dependent on roughness orientation. Solving these equations lead to a presentation of the dynamic characteristics of lubricating films existing between computer flying heads and textured media. Squeeze effects owing to moving roughness accompanying high-frequency spacing variation are found to be given as a function of arithmetically averaged film thickness minus harmonically averaged film thickness. The calculation procedure using the finite element method is then presented for the averaged static and dynamic lubrication equations. Stiffness and damping coefficient are demonstrated indicating the effects of roughness orientation and roughness movement. Under the fixed static film conditions, the roughness decreases the stiffness. In contrast to this, the roughness only slightly affects the damping coefficient. Under fixed load and loading point conditions, these relationships are inversed. It is interesting to note that damping coefficients are decreased by longitudinal roughness and are increased by moving transverse roughness. The reason for this tendency is considered to be that the moving transverse roughness serves to generate the squeeze damping force.

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Cui, Rui Hai, Zhao Hua Jiang i Zhong Ping Yao. "Influence of Cu²⁺ Doping on the Photocatalytic Activity of TiO₂ Film". Key Engineering Materials 368-372 (luty 2008): 1483–85. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1483.

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With the approach of anodic oxidation, TiO2/Ti film doped with Cu2+ was produced in H2SO4 electrolyte mixed with CuSO4. The surface morphology and the roughness of the films were studied with atomic force microscopy. The phase composition of the films was studied by X-ray diffraction. The photocatalytic activity of the films was compared through the photocatalytic degradation rate of phenol. The relations of the photocatalytic activity to the concentration of Cu2+, the microstructure and the surface roughness of the film were investigated. The results showed that Cu2+ increased the surface roughness and restrained the growth of crystal. In addition, the phenol in aqueous solution was successfully photodegraded under visible light irradiation by Cu2+-TiO2/Ti film. The composition and structure of the film affected the catalytic activity greatly. Compared with TiO2/Ti film, the recombination rate of e- and h+ of Cu2+-TiO2/Ti film was decreased.

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Peng, Yonghong, Shuai Zhang, Fanghua Zhu, Wa Li, Yong Yi, Kai Du i Qiang Yin. "Fabrication and Characterization of Fluorinated Polyimides (PI) Films with Improved Hydrophobic Property". Nano 13, nr 07 (lipiec 2018): 1850080. http://dx.doi.org/10.1142/s1793292018500807.

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There is a demand for composite films with excellent hydrophobic properties in inertial confinement fusion (ICF) physics experiments. In this paper, we prepared fluorinated polyimide hydrophobic films using spinning and plasma etching methods. The experimental results indicate that the water contact angle for the perfluorodecyltrichlorosilane (PFTS) treatment polyimide (PI) film is 112.0[Formula: see text], which is larger than the pure PI film [Formula: see text]. The rap oil contact angle is 84.2[Formula: see text], which is also much larger than the contact angle of PI film [Formula: see text]. Moreover, the surface roughness of the prepared films was measured by white light interferometry (WLI). The surface roughness (Ra) of pure PI is 9.79[Formula: see text]nm, but with the application of FSiO2 particles, the Ra of the films increases to 65.05[Formula: see text]nm. After plasma treatment, the Ra of the PI/FSiO2 composite film increases to 186.71[Formula: see text]nm because plasma treatment can scratch the film surface and increase its roughness. However, treating the PI/FSiO2 composite film with the plasma and PFTS, the Ra is only 88.90[Formula: see text]nm. This decrease in Ra is due to the PFTS, which is able to reduce the surface roughness. The development of composite films, compared to pure PI films, could prove to be an extremely valuable material in ICF experiments.

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SURESH, K. A., YUSHAN SHI, A. BHATTACHARYYA i SATYENDRA KUMAR. "WETTING–DEWETTING TRANSITION AND CONFORMAL TO NON-CONFORMAL INTERFACIAL ROUGHNESS TRANSITION IN ULTRA-THIN LIQUID CRYSTAL FILMS ON SOLID SUBSTRATES". Modern Physics Letters B 15, nr 08 (10.04.2001): 225–33. http://dx.doi.org/10.1142/s0217984901001628.

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High-resolution X-ray reflectivity has been employed to study the structure, wetting properties, and interfacial roughness of ultra-thin liquid crystal films. The films were prepared at the air–water interface and transferred on to glass substrates by a modified horizontal deposition technique. A 3-layer film was found to partially-wet the substrate in the nematic and isotropic phases and dewet upon cooling to the crystalline phase. The surface roughnesses at the air-film and the film-glass interfaces exhibited a gradual reversible but hysteretic conformal (strongly correlated) to non-conformal transition between the isotropic and smectic-A phases.

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Rozprawy doktorskie na temat "Film roughness"

Lee, Hyunjin. "Radiative properties of silicon wafers with microroughness and thin-film coatings". Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-07092006-181152/.

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Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2006.
Zhang, Zhuomin, Committee Chair ; Joshi, Yogendra, Committee Member ; Lee, Kok-Meng, Committee Member ; Gallivan, Martha, Committee Member ; Zhao, Yiping, Committee Member.

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Guegan, Johan. "Experimental investigation into the influence of roughness on friction and film thickness in EHD contacts". Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/53388.

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The roughness of machined surfaces such as those in bearings and gears is characterized by asperities which cover a wide spectrum of wavelengths and heights. When the height of the asperities becomes comparable to the lubricant film thickness, the roughness is known to influence friction and wear behaviour. This thesis reports an experimental investigation into the effect of roughness on the film thickness and friction in EHD contact. This work focuses on the particular roughness case of ridges oriented parallel to the rolling-sliding direction, such as the ones produced on raceways during the manufacturing process of rolling element bearings. To carry-out this research a ball-on disk test rig was used to model the contact between the ball and the ring of a ball bearing. The disks were made of glass to enable the lubricant film thickness to be measured through an optical technique based on optical interferometry. The ball specimens were made of AISI 52100 steel and they were roughened with a cutting tool, resulting in longitudinally oriented roughness ridges showing a dominant wavelength and amplitude. The friction was measured through a torque meter attached to the ball shaft. A duo-chromatic system using two LEDs was developed in order to be able to measure the film thickness over a wider range of film thickness. A novel procedure was also introduced to enable the film thickness in rough EHD contacts to be measured accurately. The film thickness and the friction produced by specimens with various amplitude and wavelength were measured under pure rolling and rolling-sliding conditions. The roughness was found to have a big influence on both film build-up and friction. In particular, under the same operating condition, a rough specimen will generate a thinner minimum film and a higher friction compared to a smooth specimen. At the top of the asperities, a micro-EHD film was found to form. As suggested by friction and pressure measurements, the conditions in this micro film are severe enough to reach the limiting shear stress of the lubricant.

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Cardwell, Nicholas Don. "Effects of Realistic First-Stage Turbine Endwall Features". Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/36121.

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The modern gas turbine engine requires innovative cooling techniques to protect its internal components from the harsh operating environment typically seen downstream of the combustor. Much research has been performed on the design of these cooling techniques thus allowing for combustion temperatures higher than the melting point of the parts within the turbine. As turbine inlet temperatures and efficiencies continue to increase, it becomes vitally important to correctly and realistically model all of the turbine's external cooling features so as to provide the most accurate representation of the associated heat transfer to the metal surfaces. This study examines the effect of several realistic endwall features for a turbine vane endwall. The first study addresses the effects of a mid-passage gap, endwall misalignment, and roughness on endwall film-cooling. The second study focuses on the effect of varying the combustor-to-turbine gap width. Both studies were performed in a large-scale low speed wind tunnel with the same vane geometry. Geometric and flow parameters were varied and the variation in endwall cooling effectiveness was evaluated. Results from these studies show that realistic features, such as surface roughness, can reduce the effectiveness of endwall cooling designs while other realistic features, such as varying the combustor-to-turbine gap width, can significantly improve endwall cooling effectiveness. It was found that, for a given coolant mass flowrate, a narrow combustor-turbine gap width greatly increased the coverage area of the leaked coolant, even increasing adiabatic effectiveness upstream of the vane stagnation point. The turbine designer can also more efficiently utilize leaked coolant from the combustor-to-turbine gap by controlling endwall misalignment, thereby reducing the overall amount of film-cooling needed for the first stage.
Master of Science

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Shioya, Nobutaka. "Development of Analytical Technique of Molecular Orientation in a Thin Film and Its Application to Low-Crystallinity Organic Thin Films Having a Surface Roughness". Kyoto University, 2018. http://hdl.handle.net/2433/232268.

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Aghasi, Paul P. "Dependence of Film Cooling Effectiveness on 3D Printed Cooling Holes". University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1458893416.

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Webb, Joshua J. "The Effect of Particle Size and Film Cooling on Nozzle Guide Vane Deposition". The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1313528110.

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Pavlík, František. "Studium vlivu parametru elipticity na rozložení tloušťky mazacího filmu". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229941.

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Diploma thesis deals with elastohydrodynamic lubrication of point contacts, which surfaces are influenced by topography and velocity vector of one rubbing surface is misaligned. Author summarizes knowledge of previously published research articles, which fundamentally enrich current state of knowledge. Diploma thesis contains experimental measurement results of the film thickness and the way of lubrication film formation in elliptical contact for different ellipticity parameters, kinds of rubbing surfaces and angles of the velocity vector. New findings have helped to better understand the behaviour of highly loaded lubricated contacts taking place in machine components and completed the current state of knowledge with results that can be used in next thorough study of this issue.

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Fratini, Christopher M. "Study of the Morphology and Optical Properties of Propylene/Ethylene Copolymer Films". Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/27211.

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The development of a new catalyst system by The Dow Chemical Company has resulted in the production of isotactic polypropylene and propylene/ethylene copolymers with a unique defect and comonomer distribution. This work investigated the morphology and optical properties of cast and compression molded films made from the homopolymer and copolymers with up to 20 mol% ethylene comonomer. The defect distribution of the Dow Chemical copolymers resulted in materials with lower crystallinity than Ziegler-Natta or metallocene-made materials of similar ethylene content. These materials exhibited a gamma-phase crystal content ranging from 0-95%, depending on ethylene content, processing condition, and catalyst type. The gamma-phase crystal content of quiescently crystallized copolymer films was found to significantly influence their bulk optical properties, presumably through a change in the spherulite birefringence. The bulk haze, clarity, and transparency of a homopolymer film were degraded through annealing treatments, which decreased the fraction of gamma-phase crystallinity and increased the thickness of existing lamellae, resulting in an increased intensity of scattered light and a corresponding degradation in the optical properties of the film. The haze, clarity, transparency, and gloss of the copolymer films were found to improve at higher comonomer content and higher cooling rates. The variation in the length scale and degree of disorder in the bulk morphology of films processed under different conditions was shown to correlate with the optical quality of the films, with smaller scale morphologies scattering less light and resulting in films with better optical properties. It was also shown that no single metric can completely describe the optical quality of a polymer film; the relative importance of haze, transparency, and gloss, which depends on the intended application of the film, was discussed. The influence of surface scattering from the films was controlled through the compression molding of films using substrates of different surface roughness. The contribution of light scattered from the surface of the films was isolated and found to play a significant role in the degradation of optical quality.
Ph. D.

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Sugar, Joshua D. "Mechanisms of microstructure development at metallic-interlayer/ceramic interfaces during liquid-film-assisted bonding". Berkeley, Calif. : Oak Ridge, Tenn. : Lawrence Berkeley National Laboratory ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2003. http://www.osti.gov/servlets/purl/825347-j6A0Su/native/.

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Thesis (M.S.); Submitted to the University of California, Berkeley, CA (US); 1 Dec 2003.
Published through the Information Bridge: DOE Scientific and Technical Information. "LBNL--54185" Sugar, Joshua D. USDOE Director. Office of Science. Basic Energy Sciences (US) 12/01/2003. Report is also available in paper and microfiche from NTIS.

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Simon, Darren, i s3027589@student rmit edu au. "Chemistry and Morphology of Polymer Thin Films for Electro-Optical Application". RMIT University. Applied Sciences, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20070123.122707.

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Thin polymer films and their properties have been investigated. The characteristics of crystalline polymers according to film thickness have been improved using polycaprolactone (PCL). The melting enthalpy of PCL has increased when the film thickness decreased and the peak melting temperature showed no significant changes with film thickness. Film thickness variation influenced surface roughness and crystal size. Optical microscope images showed the rougher surface of thicker films. The spinning time has shown no influence on film thickness and no significant changes to surface roughness. Thin films of block copolymers were used in the surface modification study; films studied included poly(styrene-b-butadiene-b-styrene) (SBS) and poly(styrene-b-isoprene-b-styrene) (SIS) and their surface modifications have been controlled using different methods of treatment. Films of SIS heated at different temperatures have shown different surface texture and roughness. Films treated at low temperature (45 °C) had smooth surfaces when compared with films heated at high temperature (120 °C and 160 °C). Phase separation of SIS heated at (120 °C and 160 °C) caused bulges of different sizes to cover the surface. The height and width of the bulges showed variation with film thickness and heating. Substrate interaction with SBS and SIS block copolymer films showed different surface texture when using the same type of substrate and different texture were obtained when SBS solutions were spun onto different substrates. It has been demonstrated that using different solvents in copolymer preparation caused different texture. Thermal and surface property variations with film thickness have been improved using amorphous polymers. Surface roughness of poly(methyl methacrylate) PMMA and disperse red 1-poly(methyl methacrylate) DR1-PMMA, PMMA has improved using thickness variation. Glass transition temperature measurement has increased when film thickness was increased. The glass transition temperature (Tg) and surface roughness of UV15 UV - curable coating polymer has been modified using UV curing and heating methods. Tg variation was observed when curing time and curing intensity were changed causing the optical properties of the polymer to be more variable. A plasma etcher caused wrinkles to occur on the surface of unheated UV15. Tg of UV15 increased when curing time increased. The Fourier Transform Infrared Spectroscopy (FTIR) spectra of cured UV15 film have shown peak variations of the ester and carbon double bond regions over the range of 1850-1700 cm-1. Urethane-Urea (UU) Polymer thin films were used to investigate optical properties and develop an optical waveguide. Absorption and transmission properties of light using non-linear optical (NLO) polymer was investigated and used in optical waveguide fabrication. Refractive indices were measured to examine UU films at two different wavelengths. A UU film of 1 µm thickness caused a maximum absorption at max = 471 nm also obtained at 810 nm wavelength. Many methods of fabrication were used; photolithography, plasma etching in a barrel reactor and thin film deposition using sputtering and evaporation. Etched depths from 1 μm to 100 μm were obtained. An optical waveguide has been prepared using plasma etching of a cured UV15 as a cladding layer on a silicon substrate.

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Książki na temat "Film roughness"

1935-, Aboudi Jacob, Arnold S. M i NASA Glenn Research Center, red. The effect of interface roughness and oxide film thickness on the inelastic response of thermal barrier coatings to thermal cycling. Cleveland, Ohio: National Aeronautics and Space Administration, Glenn Research Center, 1999.

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The effect of interface roughness and oxide film thickness on the inelastic response of thermal barrier coatings to thermal cycling. Cleveland, Ohio: National Aeronautics and Space Administration, Glenn Research Center, 1999.

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Części książek na temat "Film roughness"

Fukushima, Manabu, Seiji Nakano i Hideki Kita. "Ceramic Surface Roughness Modification Using A Polymethylsilsesquioxane and Silicon Oxycarbide Film Coating". W Ceramic Transactions Series, 289–94. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118144145.ch45.

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Itoh, M., K. Aota, R. Sugano i H. Takano. "Reduction of Thin Film Surface Roughness by Self-Assembling of Organic Molecules". W Ceramic Transactions Series, 467–74. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118406038.ch57.

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Woods, D. C., R. L. Fletcher i E. B. G. Jones. "Microfouling Film Composition, Thickness and Surface Roughness on Ship Trial Antifouling Paints". W Biodeterioration 7, 49–56. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1363-9_7.

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Park, Bo Hyeon, Hyun Sik Oh, Seok Pyo Hong i Sang Jeen Hong. "Analysis of Surface Roughness of Immersion Sn Plating Film via Micro Etch Process". W Advanced Materials Research, 425–28. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-463-4.425.

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Adeshara, Jatinkumar V., M. B. Prajapati, G. M. Deheri i R. M. Patel. "Study of Longitudinal Roughness on Hydromagnetic Squeeze Film Between Conducting Rotating Circular Plates". W Advances in Intelligent Systems and Computing, 219–33. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0184-5_20.

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Peng, Zhilong. "Effects of Surface Roughness and Film Thickness on the Adhesion of a Bio-inspired Nanofilm". W Springer Theses, 55–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46955-2_5.

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Olmeda, R., P. Breda, C. Stemmer i M. Pfitzner. "Large-Eddy Simulations for the Wall Heat Flux Prediction of a Film-Cooled Single-Element Combustion Chamber". W Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 223–34. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_14.

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Abstract In order for modern launcher engines to work at their optimum, film cooling can be used to preserve the structural integrity of the combustion chamber. The analysis of this cooling system by means of CFD is complex due to the extreme physical conditions and effects like turbulent fluctuations damping and recombination processes in the boundary layer which locally change the transport properties of the fluid. The combustion phenomena are modeled by means of Flamelet tables taking into account the enthalpy loss in the proximity of the chamber walls. In this work, Large-Eddy Simulations of a single-element combustion chamber experimentally investigated at the Technical University of Munich are carried out at cooled and non-cooled conditions. Compared with the experiment, the LES shows improved results with respect to RANS simulations published. The influence of wall roughness on the wall heat flux is also studied, as it plays an important role for the lifespan of a rocket engine combustors.

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Tarakci, M., i S. Guruswamy. "Influence of Surface Roughness on the Coercivity and Magnetic Interactions in CoCrX (X=Pt,Pd,Ta,B) Thin Film Media". W Surface Engineering, 283–92. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118788325.ch28.

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Mwema, Fredrick Madaraka, Esther Titilayo Akinlabi i Oluseyi Philip Oladijo. "Mono-Fractal Analyses of Roughness of Sputtered Films". W Sputtered Thin Films, 101–36. First edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, LLC, 2021. | Series: Engineering materials book series: CRC Press, 2021. http://dx.doi.org/10.1201/9781003053507-7.

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Trost, M., i S. Schröder. "Roughness and Scatter in Optical Coatings". W Optical Characterization of Thin Solid Films, 377–405. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75325-6_14.

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Streszczenia konferencji na temat "Film roughness"

Morris, Nicholas J., Joaquin M. Gutierrez, Ever J. Barbero i Darran R. Cairns. "Polymer Skins With Switchable Roughness". W ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-5129.

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Polyvinyl alcohol (PVA) films with embedded electrically-responsive liquid crystal (LC) ellipsoids were fabricated to develop a membrane coating featuring tunable roughness. Membranes (∼30 microns thick) were placed between opposing pieces of indium-tin oxide (ITO) glass, creating electrodes for creation of a uniform electric field. Applied voltages ranged from 0V–350 V, as films were observed using an optical microscope. Thin-film interference patterns were observed in various regions of each film and were measured. Contour plots of film displacement were created and showed elevations across the observed region. The area of the first dark fringe regions, assumed to be in contact with the top glass surface, were measured as a function of applied voltage. The maximum displacement of the film was estimated to reach 1.5 microns and the area in contacted with the top glass surface increased 127% between 0–350 V. Finite element modelling results illustrate the influence of polarity on the roughness of the film surface.

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Schmidt, Donald L., Basav Sen i David G. Bogard. "Effects of Surface Roughness on Film Cooling". W ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-299.

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A flat plate test section was used to study how surface roughness representative of an in-service turbine affects the film cooling adiabatic effectiveness and heat transfer coefficient for a round hole geometry. The injection was from a single row of round film cooling holes with injection angle of 30°. The density ratio of the injectant to the mainstream was 2.0 for the adiabatic effectiveness tests, and 1.0 for the heat transfer coefficient tests. A range of momentum flux ratios was examined to characterize the adiabatic effectiveness and heat transfer performance. Streamwise distributions of adiabatic effectiveness and heat transfer coefficients were obtained along the hole center line, and lateral distributions extending to halfway between hole centerlines were obtained at selected streamwise locations to 90 hole diameters downstream. Two rough surfaces with a factor of two difference in roughness levels were compared to an aerodynamically smooth surface. Both rough surfaces degraded the film cooling effectiveness with increasing degradation farther downstream. Degradation of film cooling effectiveness was greater at low momentum flux ratios. At momentum flux ratios high enough so that the cooling jets completely detached from the surface, the rough surfaces slightly increased adiabatic effectiveness in some cases. There was little difference in the effectiveness results between the two rough surfaces. Film cooling injection had little effect on heat transfer rates for any of the surfaces.

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Tielking, John, i V. Thomas. "The effect of film thickness on the fracture roughness of balloon film". W 32nd Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1994. http://dx.doi.org/10.2514/6.1994-634.

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Southwell, W. H. "Coherence Loss Due To Thin Film Interface Roughness". W 1986 International Symposium/Innsbruck, redaktor J. Roland Jacobsson. SPIE, 1986. http://dx.doi.org/10.1117/12.938393.

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Shen, Zhengxiang, Bin Ma, Tao Ding, Xiaoqiang Wang, ZhanShan Wang, Lishuan Wang, Huasong Liu i Yiqin Ji. "Fabrication and quantitative characterization of super smooth surface with sub-nanometer roughness". W Seventh International Conference on Thin Film Physics and Applications, redaktorzy Junhao Chu i Zhanshan Wang. SPIE, 2010. http://dx.doi.org/10.1117/12.888916.

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Karabekov, Albert Y., i Igor V. Kozhevnikov. "Peculiarities of x-ray scattering by thin-film roughness". W X-ray Optics and Surface Science, redaktor Alexander V. Vinogradov. SPIE, 1995. http://dx.doi.org/10.1117/12.200273.

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Inoue, Y., i K. Ikuta. "Cell based microactuator with controlled roughness of thin film". W TRANSDUCERS 2015 - 2015 18th International Solid-State Sensors, Actuators and Microsystems Conference. IEEE, 2015. http://dx.doi.org/10.1109/transducers.2015.7181271.

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Osipov, M. I. "EFFICIENCY OF FILM COOLING WITH INFLUENCE OF SURFACE ROUGHNESS". W International Heat Transfer Conference 10. Connecticut: Begellhouse, 1994. http://dx.doi.org/10.1615/ihtc10.1130.

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Han, Guoqiang, Zhuangde Jiang, Weixuan Jing i Mingzhi Zhu. "Effects of Substrate Properties, Film Thickness and Evaporation Rate on the Surface Roughness of Ultra Thin Titanium Films". W 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21096.

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Ultra thin (less than 50nm) titanium films with various thicknesses are systematically deposited on different substrates by electron-beam evaporation at various deposition rates in order to correlate flat titanium film surface roughness with deposition process parameters. In this paper, the influences of the substrate surface properties, film thickness and evaporation rate on surface roughness of flat ultra thin titanium films are clarified. In this study, distinct and abrupt steps on the film surface were fabricated by masks pasted on the substrate surfaces during the deposition process. The step can be scanned with stylus profilometer to reveal the height of the step (the thickness of the thin film). Ultra thin films with height 20–50 nm were routinely measured in this way. It is important to notice that ultra thin titanium films with different surface roughness but having the same film thickness can be obtained in a controllable way. Therefore, the control of substrate surface roughness, film thickness and evaporation process is essential to prepare ultra thin titanium films with desired surface properties in reproducible way for further biological and nanostructure investigations of these materials.

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Boutaous, M’hamed, i Patrick Bourgin. "Macroscopic Effects of Surface Roughness in Confined Air-Flow". W ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33831.

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The general framework deals with the winding of thin plastic films. It is well known by the man-of-the art that the “windability” of plastic films is mainly governed by their surface topography. One key issue is then to optimize their surface topography so that to improve the quality of the wound roll. In a previous work, we proposed a simple model which considers the flow of an air layer squeezed between a solid smooth substrate and a plastic film sample : it was shown experimentally that the macroscopic characteristics of the flow are connected to the film roughness, but how? To answer this question, we assimilate the confined air flow to a flow through a periodic array of cylinders. A mathematical model based on homogenization techniques was proposed, where the heights of the cylinders, their diameter and their spatial distribution are the governing parameters. In the present paper, we propose pertinent parameters which describes the real surface roughness of plastic films fairly well. The measurements were carried out by using a 3D roughness measurement device. The first observation is that the films roughness distribution is not uniform, but forms “packages” (agglomerates) giving place to large packs of roughness. We made a sampling at different levels expressed by the percentage of peaks exceeding some given height. The heights of the peaks over a threshold value are averaged and the corresponding averaged value will be regarded as the initial gap in the squeeze flow model. Now, the networks of cylinders is built as follows : • The cylinder diameters is the averaged width of the large peaks, • The distance between the cylinder axes is the mean value of the spatial distribution of the peaks. Thus, for each type of film, the threshold value will be the only adjustable parameter. Introducing these parameters into the mathematical model which predicts the evolution of the squeezed air layer and comparing to the experimental data, the following results are obtained: (1) It is possible to adjust one single parameter so that to obtain a very good agreement between the experimental data and the theoretical results. (2) The smoother the film, the more important the highest peaks are in terms of air leakage.

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Raporty organizacyjne na temat "Film roughness"

Raben, Sam, Pavlos Vlachos i Wing Ng. Effects of Leading Edge Film-Cooling and Surface Roughness on the Downstream Film-Cooling Along a Transonic Turbine Blade for Low and High Free-Stream Turbulence. Fort Belvoir, VA: Defense Technical Information Center, luty 2008. http://dx.doi.org/10.21236/ada479415.

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Berney, Ernest, Naveen Ganesh, Andrew Ward, J. Newman i John Rushing. Methodology for remote assessment of pavement distresses from point cloud analysis. Engineer Research and Development Center (U.S.), kwiecień 2021. http://dx.doi.org/10.21079/11681/40401.

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The ability to remotely assess road and airfield pavement condition is critical to dynamic basing, contingency deployment, convoy entry and sustainment, and post-attack reconnaissance. Current Army processes to evaluate surface condition are time-consuming and require Soldier presence. Recent developments in the area of photogrammetry and light detection and ranging (LiDAR) enable rapid generation of three-dimensional point cloud models of the pavement surface. Point clouds were generated from data collected on a series of asphalt, concrete, and unsurfaced pavements using ground- and aerial-based sensors. ERDC-developed algorithms automatically discretize the pavement surface into cross- and grid-based sections to identify physical surface distresses such as depressions, ruts, and cracks. Depressions can be sized from the point-to-point distances bounding each depression, and surface roughness is determined based on the point heights along a given cross section. Noted distresses are exported to a distress map file containing only the distress points and their locations for later visualization and quality control along with classification and quantification. Further research and automation into point cloud analysis is ongoing with the goal of enabling Soldiers with limited training the capability to rapidly assess pavement surface condition from a remote platform.

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