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Augusto Cannone Falchetto,KiHoon Moon 한국도로학회 2015 한국도로학회 학술발표회 논문집 Vol.2015 No.10
Analyzing asphalt mixture images can provide crucial information not only for generating advanced geometry structure in several numerical computations (i.e. FEM and/or DEM) codes, but also for numerically evaluating the material microstructure. It is well known that 3D X-Ray Computer Tomography (CT) can provide accurate and realistic microstructure information of asphalt mixtures; however, this technology still presents two limitations: 1) the equipment is very expensive and, therefore, only few pavement agencies can afford it, and 2) the software required to generate realistic image of asphalt mixture with three-phase structure (aggregate, asphalt binder and air-voids) is based on a global thresholding algorithm which cannot be easily accessed and edited by users and practitioners. In this paper, accurate and realistic 2D three-phase asphalt mixture images were generated using an advanced DIP analysis code (implemented on MATLABTM) and a common flatbed scanner, which can be easily purchased at relatively low price. The threshold algorithm was developed based on the computed results of Gmm (maximum specific gravity), Gmb (bulk specific gravity), VMA (voids in mineral aggregates) of given asphalt mixtures which can be experimentally obtained in a laboratory environment. 2D three-phase images of asphalt mixtures were derived from grey scale images (color intensity from 0 to 255) obtained from original RGB (Red-Green-Blue) scale images with a dual-threshold computation techniques (i.e. one step for computing air voids phase, T1, and a second step for computing asphalt binder (and/or mastic) phase, T2). An example of DIP analysis results is shown in Figure 1. Based on the computation results, quite accurate and good visual agreement was observed between RGB scale image and DIP analyzed image. The findings indicate that this advanced DIP analysis technique can provide reliable geometry and microstructural information for several numerical simulations such as finite element method (FEM) and discrete element modeling (DEM). This research work represents a solid base for performing simple 2D microstructure analysis using 2- and 3-point correlation function and for developing the Moon Cannone Falchetto (MCF) model which will be introduced in the next annual KSRE conference.
2DF ON THE AAT - PROJECT UPDATE AND FIRST SCIENTIFIC RESULTS
CANNON RUSSELL,TAYLOR KEITH The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
Construction of the 'Two-degree Field' (2dF) instrument on the Anglo-Australian Telescope (AAT) is now virtually complete and commissioning is well underway. The key components are described. Several recent milestones are reported, including the first scientific results. Future prospects and plans are discussed.
Vibration and orientation of diatomic molecules flowing through small carbon nanotubes.
Cannon, James,Kim, Daejoong,Hess, Ortwin American Scientific Publishers 2011 Journal of Nanoscience and Nanotechnology Vol.11 No.10
<P>With their unique long cylindrical shape, carbon nanotubes may one-day form nozzles for nano-scale printing or flow into a chamber. Since the scale of the flowing molecules is similar to the diameter of the nanotubes, molecular vibration, orientation and density become influenced by the confinement during flow. We have studied the flow of diatomic molecules through carbon nanotube nozzles using non-equilibrium molecular dynamics simulations, in an effort to gain a greater understanding about the fundamental properties of such molecules in such a setting. The frequency of vibration of the molecules is shown to be dependent on the density inside the nanotubes and follow the same relation as an experimental micro-scale density-frequency study suggests, although only for nanotubes above a certain diameter. Meanwhile no relation is found between the frequency of vibration and the flow rate. The effect of nanotube diameter on the orientation of the molecules is also examined in detail, showing the transition between axial and radial orientation, with 'pull' and 'push' effects determining the orientation.</P>
The initial flow dynamics of light atoms through carbon nanotubes
Cannon, James,Kim, Daejoong,Hess, Ortwin North-Holland 2011 Fluid dynamics research Vol.43 No.2
<P>Carbon nanotubes are becoming increasingly viable as membranes for application in a wide variety of nano-fluidic applications, such as nano-scale nozzles. For potential applications that utilize switching on and off of flow through nanotube nozzles, it is important to understand the initial flow dynamics. Furthermore, when the nanotube interacts strongly with the fluid, the flow may be very different from conventional simulations, which consider atoms (such as argon, for example) that interact only weakly with the nanotube. Therefore, to better understand such flows and explore the potential manipulation of flow that can be achieved, we consider the initial flow dynamics of a light fluid through carbon nanotube nozzles, using non-equilibrium molecular dynamics simulations. Our studies show that if the conditions are controlled carefully, unusual phenomena can be generated, such as pulsed flow and very nonlinear increases in flow rate with nanotube diameter. We detail the physical reasons for such phenomena and describe how the pulsation can be controlled using temperature.</P>
Influence of Ion Sizeand Charge on Osmosis
Cannon, James,Kim, Daejoong,Maruyama, Shigeo,Shiomi, Junichiro AmericanChemical Society 2012 The journal of physical chemistry. B, Condensed ma Vol.116 No.14
<P>Osmosis is fundamental to many processes, such as inthe functionof biological cells and in industrial desalination to obtain cleandrinking water. The choice of solute in industrial applications ofosmosis is highly important in maximizing efficiency and minimizingcosts. The macroscale process of osmosis originates from the nanoscaleproperties of the solvent, and therefore an understanding of the mechanismsof how these properties determine osmotic strength can be highly useful.For this reason, we have undertaken molecular dynamics simulationsto systematically study the influence of ion size and charge on thestrength of osmosis of water through carbon nanotube membranes. Ourresults show that strong osmosis occurs under optimum conditions ofion placement near the region of high water density near the membranewall and of maintenance of a strong water hydration shell around theions. The results in turn allow greater insight into the origin ofthe strong osmotic strength of real ions such as NaCl. Finally, interms of practical simulation, we highlight the importance of avoidingsize effects that can occur if the simulation cell is too small.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpcbfk/2012/jpcbfk.2012.116.issue-14/jp2113363/production/images/medium/jp-2011-113363_0010.gif'></P>