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Thèses sur le sujet « Surface roughne »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

COLOMBO, ANNALISA. "Synthesis and characterization of TiO2 polymeric nanocomposites with tailorable optical properties." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/28632.

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Main aim of this work was the fabrication and characterization of polymeric TiO2 hybrid nanocomposites. When dispersed at the nanoscale level, TiO2 can tune the optical properties of the polymeric matrix, such as the UV absorption and the increase of refractive index, preserving the transparency in the visible and the flexibility of the polymer. TiO2 nanopaticles were modified on the surface with different molecules; they were then dispersed in MMA and polymerized in bulk, in order to obtain optically transparent TiO2/Poly-methylmethacrylate (PMMA) sheets. The application of these objects wa

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Vandadi, Aref. "Optimization of Superhydrophobic Surfaces to Maintain Continuous Dropwise Condensation." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc500016/.

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In the past decade, the condensation on superhydrophobic surfaces has been investigated abundantly to achieve dropwise condensation. There is not a specific approach in choosing the size of the roughness of the superhydrophobic surfaces and it was mostly selected arbitrarily to investigate the behavior of condensates on these surfaces. In this research, we are optimizing the size of the roughness of the superhydrophobic surface in order to achieve dropwise condensation. By minimizing the resistances toward the transition of the tails of droplets from the cavities of the roughness to the top of

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3

Thoreson, Erik J. "From nanoscale to macroscale using the atomic force microscope to quantify the role of few-asperity contacts in adhesion." Link to electronic dissertation, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-010906-204218/.

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Ștefan, Gheorghiu. "Standard and nonstandard roughness - consequences for the physics of self-affine surfaces /." free to MU campus, to others for purchase, 2000. http://wwwlib.umi.com/cr/mo/fullcit?p9988664.

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5

Berry, Elizabeth. "Fabrication of multiscale random rough surfaces with prescribed surface statistics." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/37944.

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6

Yang, Hongta. "Fundamentals, preparation, and characterization of superhydrophobic wood fiber products." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24796.

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Thesis (M. S.)--Chemical Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Yulin Deng; Committee Member: Jeffery S. Hsieh; Committee Member: Sujit Banerjee; Committee Member: Zhong Lin Wang.

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7

Zhang, Yilei. "The effect of surface roughness parameters on contact and wettability of solid surfaces." [Ames, Iowa : Iowa State University], 2007.

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8

Mamo, Andrew Benedict 1982. "Surface roughness of Mars." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/32744.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2004.<br>Includes bibliographical references (p. 35-36).<br>In this thesis, I created an algorithm to compensate for the saturation of data collected by the Mars Orbiter Laser Altimeter (MOLA). Saturation of the energy measurements had made it impossible to measure surface roughness at 100 m length scales. By calculating the returned energy, the problem of saturation can be avoided. This algorithm was applied to MOLA data across the Martian surface to create an estimate of surface roughness across the planet. The method ca

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9

Li, Hongchun. "A study on wear and surface roughness of work roll in cold rolling." School of Mechanical, Materials and Mechatronic Engineering - Faculty of Engineering, 2008. http://ro.uow.edu.au/theses/125.

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The objective of this study is to improve our understanding of the evolution and tribological behaviour of work roll surfaces in cold rolling because surface deterioration affects the quality of products and the efficiency of production. The cost of rolls is almost 25% of the cost of cold steel production. An experimental Lateral Set-testing (LST) mini-mill was developed to make use of the Gleeble 3500 thermo-mechanical simulator functions to evaluate, for the first time, the roll material surface features, surface roughness, fast Fourier transform (FFT) and Power Spectral Density (PSD) of fre

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10

Al-Maaitah, Ayman Adnan. "Effect of roughness element on the stability of boundary layers." Thesis, Virginia Tech, 1986. http://hdl.handle.net/10919/45741.

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The instability of flows around hump and dip imperfections is investigated. The mean flow is calculated using interacting boundary layers, thereby accounting for viscous/inviscid interaction and separation bubbles. Then, the two-dimensional linear instability of this flow is analyzed, and the amplification factors are computed. Results are obtained for several height/width ratios and locations. The theoretical results have been used to correlate the experimental results of Greening and Walker. The observed transition locations are found to correspond to amplification factors varying between 7.

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11

Alexander, William Nathan. "Normalization of Roughness Noise on the Near-Field Wall Pressure Spectrum." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/33643.

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Roughness noise can be a significant contributor of sound in low Mach number, high Reynolds number flows. Only a small amount of experimental research has been conducted to analyze roughness noise because of its often low energy levels that are hard to isolate even in a laboratory setting. This study details efforts to scale the roughness noise while independently varying roughness size and edge velocity. Measurements were taken in the Virginia Tech Anechoic Wall Jet Facility for stochastic rough surfaces varying from hydrodynamically smooth to fully rough as well as deterministic rough surfac

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12

Beyer, Ross A. "Martian surface roughness and stratigraphy." Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/290105.

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Orbital datasets can be combined and manipulated to learn about the three-dimensional structure of planetary surfaces, and the processes that have acted on them. The Mars Orbital Camera (MOC) is providing high-resolution images. These images allow qualitative inspection of features, and contain quantitative information about the shape of the surface. Using a photoclinometry technique derived from a lunar-Lambert photometric function, I am able to obtain estimates of the down-sun slope of each pixel in an image. This technique was calibrated against synthetic topography, compared to an area pho

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13

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.<br>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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14

Cinat, Paolo. "Surface roughness genomics in contact mechanics : a new method enabling roughness design towards surface prototyping." Thesis, IMT Alti Studi Lucca, 2018. http://e-theses.imtlucca.it/252/1/Cinat_phdthesis.pdf.

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In actual age of Industry 4.0, the miniaturization of mechanical components is becoming extremely sophisticated, thanks to enhancing techniques such as additive manufacturing technologies. This requires an efficient description of multi-scale roughness to properly characterize the interface contact problem. In this dissertation, a new approach called surface roughness genomics is proposed to uniquely characterize surfaces at different length scales, from the topological point of view. Similar to biological systems, where the biological information is encoded in DNA base pairs, surface

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15

Wallqvist, Viveca. "Interactions between non-polar surfaces in water: Fokus on talc, pitch and surface roughness effects." Doctoral thesis, KTH, Ytkemi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10283.

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The aim of this thesis work was to gain understanding of the interactions between talc mineral and surfaces, liquids and chemicals relevant for industrial applications, such as pulp and paper. Talc is used in the pulp and paper industry as a filler pigment, in control of pitch (lipophilic extractives) deposits and as a coating pigment. A deeper understanding of talc interactions will be beneficial in optimizing its use. Long-range attractive interactions between talc and hydrophobic model probes, as well as pitch probes, have been measured using the atomic force microscope (AFM) colloidal prob

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16

Fujiwara, Yuko. "Evaluation of wood surface roughness as related to tactile roughness." Kyoto University, 2004. http://hdl.handle.net/2433/145425.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第11112号<br>農博第1442号<br>新制||農||898(附属図書館)<br>学位論文||H16||N3962(農学部図書室)<br>22662<br>UT51-2004-L909<br>京都大学大学院農学研究科森林科学専攻<br>(主査)教授奥村正悟, 教授増田稔, 教授池田善郎<br>学位規則第4条第1項該当

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17

Liu, Yu. "Surface roughness generated boundary layer noise." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612403.

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18

Konidaris, Spyridon G. "Electromagnetic scattering from rough surfaces using the On-Surface Radiation Boundary Condition (OSRC) method." Thesis, Monterey, California. Naval Postgraduate School, 1990. http://hdl.handle.net/10945/30624.

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Approved for public release, distribution unlimited<br>Electromagnetic scattering from rough surfaces is of prime importance in the engineering field since it affects communications, radar, remote sensing, acoustics, etc. The actual problem of scattering from rough surfaces is complicated and involves three dimensional scattering from either lossy or dielectric, electrically large surface. Integral equations are widely utilized to solve this kind of problem but this solution to the problem is generally computationally intensive. In the On-Surface Radiation Boundary Condition (OSRC) method, a h

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19

Chen, Quan, and 陳全. "Efficient numerical modeling of random surface roughness for interconnect internal impedance extraction." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B3955708X.

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20

Gilliam, David R. "A study of contact between a profile meter stylus and polymer films on roughened substrates." Thesis, Virginia Tech, 1985. http://hdl.handle.net/10919/45727.

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When a polymer film is deposited onto a roughened substrate, the film masks over the underlying substrate roughness. Then when attempting to measure the roughness of the polymer film surface using a stylus-type profile meter, the pressure between the tip of the stylus and the film is sufficient to plastically deform the polymer surface. The result is a possible erroneous measurement of the surface roughness of the polymer film. This thesis reports on attempts to quantify the actual roughness of the polymer film from the measurement obtained by the profile meter. Extensive surface profile data

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21

Waigh, David Ross Carleton University Dissertation Engineering Mechanical and Aerospace. "An Improved correlation for representing surface roughness effects on the law of the wall in fully rough conditions." Ottawa, 1996.

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22

Ward, R. L. "Roughness measurements of machined workpieces." Thesis, Leeds Beckett University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314787.

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23

Hakim, Ali. "Characterization of Hard Metal Surfaces after Various Surface Process Treatments." Thesis, Linköping University, The Department of Physics, Chemistry and Biology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-12433.

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<p>The aim of this thesis is to investigate how material surfaces are affected by various surface treatments and how this relates to the adhesion of the coating. The materials that were studied were WC-Co and Cermets and the surface treatments used were polishing, grinding with coarser and finer abrasive grains, and finally wet blasting and dry blasting. Focus was on deformations and residual stresses in the surface, surface roughness and cracks. The test methods used for examining the samples included surface roughness measurements, residual stress measurements, adhesion tests using Rockwell

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24

Park, Jung Hwa. "The role of surface chemistry and wettability of microtextured titanium surfaces in osteoblast differentiation." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44732.

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Biomaterial surface energy, chemical composition, charge, wettability and roughness all play an important role in determining the degree of the direct bone-to-implant interface, termed osseointegration. Surface chemistry, which is influenced by surface energy, wettability, and composition, is another factor that determines osteoblast phenotype and regulates osteoblast maturation. Increased surface energy is desirable for bone implants due to enhanced interaction between the implant surface and the biological environment. The extent of bone formation in vivo is also increased with increasing wa

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25

Lewis, Gareth Dafydd. "Polarimetric signatures of roughened surfaces." Thesis, Cranfield University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422187.

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26

Panth, Mohan. "USING SURFACE TENSION GRADIENTS AND MAGNETIC FIELD TO INFLUENCE FERROFLUID AND WATER DROPLET BEHAVIOR ON METAL SURFACES." Miami University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=miami1470164188.

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27

Isleyici, Umut. "Effect Of Surface Roughness On Ultrasonic Testing." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606937/index.pdf.

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This study investigates the effect of front surface roughness on ultrasonic echo amplitude. Experiments were carried out on specimens whose front surfaces are machined by milling machine. Machining parameters were changed in milling process in order to obtain desired roughness values and milling head was tilted to a very small angle to obtain periodic rough surfaces. Experiments were performed with these specimens having roughness value of 0.5, 4.5, 11, 26.5 &micro<br>m. Ra. The back surface roughness of all specimens was kept constant at 1.5 &micro<br>m Ra by grinding operation. 1.5, 2, 3, 4

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28

Wu, Jiunn-Jong. "Surface roughness and its role in contact." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363100.

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29

Zhang, Cheng. "Influence of surface roughness on thermography measurement." Thesis, Högskolan Väst, Avd för automationssystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-6842.

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This university Bachelor's Thesis was performed to explore the influence of surface roughness on the thermography measurement. Thermography is a non-destructive testing method which can be used to detect cracks. However, it is hard to define how the surface roughness influences the emissivity and the result of a thermography measurement, as well as how the angle of the excitation source influences the result. Therefore, this work aims to define how the heating angle and surface roughness influence the thermography measurement, define the relationship between surface roughness and emissivity fo

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30

Kulkarni, Amit S. "Effects of surface roughness in microchannel flows." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0003400.

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31

Sharma, Priyanka. "Investigations of Titan's Topography and Surface Roughness." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/241978.

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Saturn's moon, Titan is a geomorphologically active planetary object, and its surface is influenced by multiple processes like impact cratering, fluvial and aeolian erosion, lacustrine processes, tectonics, cryovolcanism and mantling. Disentangling the processes that compete to shape Titan's landscape is difficult in the absence of global topography data. In this thesis, I utilize techniques in topographic statistics, fractal theory, study of terrestrial analogs and landscape evolution modeling to characterize Titan's topography and surface roughness and investigate the relative roles of surfa

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32

Wallace, Karen Sue 1957. "SURFACE ROUGHNESS EFFECTS ON SOIL SPECTRAL REFLECTANCE." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/275522.

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Shaw, Joseph Alan 1962. "Laser-glint measurements of sea-surface roughness." Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/290653.

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Optical glint patterns convey information about the roughness of the surface on which they are formed. This dissertation describes two new optical instruments that relate the variations of specular laser reflections (laser glints) from the sea surface in angular, temporal, and wavenumber space to the surface roughness. Measurements from these instruments are interpreted with the objective of improving the capabilities of remote-sensing instruments that view the ocean surface. Particular attention is paid to cm waves, which are resonant structures for microwave sensors and the most significant

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34

Kozin, Philipp A. "Charge Development at Iron Oxyhydroxide Surfaces : The Interplay between Surface Structure, Particle Morphology and Counterion Identity." Doctoral thesis, Umeå universitet, Kemiska institutionen, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-85195.

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Iron (oxyhydr)oxide (FeOOH) minerals play important roles in various natural, technological and societal settings. The widespread abundance of these minerals has prompted numerous studies on their surface reactivity in aqueous media. Surface charge development, one that namely takes place through the adsorption of potential determining ions (p.d.i.; H+, OH-) and coadsorption of counterions (e.g. Cl-, ClO4-, Na+), is particularly interesting in this regard. Mineral surface charge development is determined by numerous factors related to the interplay of mineral surface structure, particle morpho

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35

Peters, Wayne D. "Rough-surface gravity current flows." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0017/NQ46297.pdf.

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36

Peters, Wayne. "Rough-surface gravity current flows." Thesis, University of New Brunswick, 1999. http://hdl.handle.net/1882/814.

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37

Hansson, Petra M. "Hydrophobic surfaces: Effect of surface structure on wetting and interaction forces." Doctoral thesis, KTH, Yt- och korrosionsvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103409.

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The use of hydrophobic surfaces is important for many processes both in nature and industry. Interactions between hydrophobic species play a key role in industrial applications such as water-cleaning procedures and pitch control during papermaking but they also give information on how to design surfaces like hydrophobic mineral pigments. In this thesis, the influence of surface properties on wetting and interaction forces has been studied. Surfaces with close-packed particles, pore arrays, randomly deposited nanoparticles as well as reference surfaces were prepared. The atomic force microscope

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38

Ellis, Matthew A. "Roughness length variability over heterogeneous surfaces." Thesis, Monterey, California : Naval Postgraduate School, 2010. http://edocs.nps.edu/npspubs/scholarly/theses/2010/Mar/10Mar%5FEllis.pdf.

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Thesis (M.S. in Meteorology)--Naval Postgraduate School, March 2010.<br>Thesis Advisor(s): Wang, Qing. Second Reader: Nuss, Wendell A. "March 2010." Description based on title screen as viewed on April 26, 2010. Author(s) subject terms: Atmospheric Boundary Layer, Turbulence, Roughness Length, Momentum Flux, Heat Flux, Flus-profile Relationships, Monin-Obukhov Similarity Theory, Heterogeneous Surfaces. Includes bibliographical references (p. 73-75). Also available in print.

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Gurau, Lidia. "The roughness of sanded wood surfaces." Thesis, Brunel University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399646.

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40

Manu, Dabankah Emmanuel. "Surface Roughness Characterization of hole walls in fibercomposites." Thesis, KTH, Industriell produktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-140314.

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In the manufacturing of fibrecomposite structures for the aircraft industry many holes are drilled through the composite for the attachment of the composite to a metal frame. These holes have a Ra specification of the cylindrical walls. The measurement of this roughness is tedious work if made by a stylus profiler. In this thesis, a design concept is created and tested by using OSLO raytracing program. This employed raytracing simulation is used to analyze and study variation of the surface features of the hole and evaluate the corresponding resultant image afterwards using image quality indic

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41

Cullen, Lachlan Michael. "Acoustic receptivity in boundary layers with surface roughness." Thesis, Queen Mary, University of London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327024.

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42

Gadsby, Philip. "Surface roughness effects on thermally stressed aviation fuel." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/19191/.

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Thermal instability in aviation fuels has been thoroughly explored over the last 50 years. The problem is complex, with coupling of fuel chemistry, heat transfer and fluid dynamics. Most efforts have been applied to the chemical kinetics of deposit formation and studying physical effects such as temperature, flow rate and Reynolds number in a multitude of small to large scale testing devices. However, much less attention has been paid to the effects of wall surface roughness. This is surprising - since for turbulent flow, wall roughness enhances momentum, heat and mass transfer by disrupting t

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Munoz-Escalona, Patricia. "Surface roughness prediction when milling with square inserts." Thesis, University of Bath, 2010. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519033.

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44

Rellick, Lorraine Mary. "Local packing densities and surface roughness of proteins /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487759055158724.

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45

Almqvist, Andreas. "On the effects of surface roughness in lubrication." Doctoral thesis, Luleå tekniska universitet, Maskinelement, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18259.

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Tribology is a multidisciplinary field defined as the science and technology of interacting surfaces in relative motion, and embraces the study of friction, wear and lubrication. A typical tribological application is the rolling element bearing. Tribological contacts may also be found in other types of bearings, cam-mechanisms, gearboxes and hydraulic systems. Examples of bearings inside the human body are the operation of the human hip joint and the contact between teeth during chewing. To fully understand the operation of this type of application one has to understand the couplings between t

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46

Landais, François. "Lois d’échelles et propriétés statistiques multifractales de la topographie des planètes." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS453/document.

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Au cours des 20 dernières années, le développement des méthodes de télédétection et le succès des missions spatiales ont considérablement enrichi nos connaissances sur les surfaces planétaires révélant une immense diversité de morphologies. Etant le reflet de l'interaction et de la compétition entre des processus géologiques dont les modalités sont variables d'un corps à l'autre, elles sont largement étudiées pour retracer l'histoire géologique des planètes telluriques. En particulier, des informations précieuses sur la nature des processus et sur les lois générales qui contrôlent la formation

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47

Sen, Mehmet Ali. "Proper Orthogonal Decomposition Methodology to Understand Underlying Physics of Rough-Wall Turbulent Boundary Layer." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/SenMA2007.pdf.

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48

Ergin, Fahrettin Gökhan. "Roughness Induced Transition." Case Western Reserve University School of Graduate Studies / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=case1121435967.

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49

Valkonen, Aki Ensio. "Plastic deformation and roughness of free metal surfaces /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487330761216718.

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50

Lee, Christopher Gee-Yin. "The design of a towed laser slopemeter system for the measurement of short scale sea waves." Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295613.

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