Bibliografias temáticas / Interface phenomenon

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Literatura científica selecionada sobre o tema "Interface phenomenon"

Autor: Grafiati

Publicado: 19 de outubro de 2024

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Artigos de revistas sobre o assunto "Interface phenomenon"

Agrawal, S. "Bubble dynamics and interface phenomenon". Journal of Engineering and Technology Research 5, n.º 3 (31 de março de 2013): 42–50. http://dx.doi.org/10.5897/jetr2013.0297.

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Dai, Jinghang, e Zhiting Tian. "Nanoscale thermal interface rectification in the quantum regime". Applied Physics Letters 122, n.º 12 (20 de março de 2023): 122204. http://dx.doi.org/10.1063/5.0143038.

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To enable the on-demand control of heat flow for sustainable energy solutions, we have been longing for functional thermal components at the nanoscale, in analogue to electronic diodes and transistors. Understanding and discovering fundamental mechanisms that drive thermal rectification are critical to advancing this field. Different mechanisms have been proposed for thermal rectification effects in the classical regime. Using anharmonic atomistic Green's function, we discovered a thermal rectification phenomenon in the quantum regime for nanometer-thick three-dimensional solid interfaces. We found that the anharmonic phonon scatterings across the interface act on the temperature-dependent phonon populations on both sides of the interface, generating the necessary nonlinearity to achieve thermal rectification. This intrinsic thermal interface rectification is a universal phenomenon that can be observed and engineered for nanoscale interfaces.

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ROJAS, RENÉ G., RICARDO G. ELÍAS e MARCEL G. CLERC. "DYNAMICS OF AN INTERFACE CONNECTING A STRIPE PATTERN AND A UNIFORM STATE: AMENDED NEWELL–WHITEHEAD–SEGEL EQUATION". International Journal of Bifurcation and Chaos 19, n.º 08 (agosto de 2009): 2801–12. http://dx.doi.org/10.1142/s0218127409024499.

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The dynamics of an interface connecting a stationary stripe pattern with a homogeneous state is studied. The conventional approach which describes this interface, Newell–Whitehead–Segel amplitude equation, does not account for the rich dynamics exhibited by these interfaces. By amending this amplitude equation with a nonresonate term, we can describe this interface and its dynamics in a unified manner. This model exhibits a rich and complex transversal dynamics at the interface, including front propagations, transversal patterns, locking phenomenon, and transversal localized structures.

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Habert, J., T. Machej e T. Czeppe. "The phenomenon of wetting at solid/solid interface". Surface Science Letters 151, n.º 1 (março de 1985): A80. http://dx.doi.org/10.1016/0167-2584(85)90633-4.

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Haber, J., T. Machej e T. Czeppe. "The phenomenon of wetting at solid/solid interface". Surface Science 151, n.º 1 (março de 1985): 301–10. http://dx.doi.org/10.1016/0039-6028(85)90468-6.

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Rezaee, Nastaran, John Aunna e Jamal Naser. "Marangoni Flow Investigation in Foam Fractionation Phenomenon". Fluids 8, n.º 7 (18 de julho de 2023): 209. http://dx.doi.org/10.3390/fluids8070209.

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In this study, a numerical investigation of the Marangoni flow in foam fractionation was conducted, with a specific focus on the film of micro-foams in both the interior and exterior regions. A three-dimensional node–film–plateau border system was employed to model the system, utilizing time-dependent mass conservation equations. The study emphasized the influence of the surfactant concentration in the foam fractionation column and the mobility of the air–liquid interface on the Marangoni velocity within the film. The results indicated that higher surfactant concentration in the reflux column resulted in a significant increase in Marangoni velocities. Furthermore, a mobile interface enhanced the Marangoni flow, whereas a rigid interface reduced its intensity. The behaviour of the Marangoni flow was explored in both interior and exterior foams, revealing distinct characteristics. The presence of a wall in the exterior foam altered the flow dynamics, leading to a reduced Marangoni velocity compared to interior films.

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Yin, Lan, S. Balaji e S. Seetharaman. "Effects of Nickel on Interface Morphology during Oxidation of Fe-Cu-Ni Alloys". Defect and Diffusion Forum 297-301 (abril de 2010): 318–29. http://dx.doi.org/10.4028/www.scientific.net/ddf.297-301.318.

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Steel produced in Electric Arc Furnaces (EAF) contain a high amount of copper that causes a detrimental surface cracking phenomenon called hot shortness. Studies have found that nickel can alleviate hot shortness by increasing copper solubility in the Fe phase, decreasing oxidation rate and promoting occlusion [1-3]. Occlusion is a phenomenon whereby the copper-rich phase becomes incorporated into iron oxides. Nickel promotes occlusion by causing an uneven interface and increasing the number of internal oxides. The uneven interface is likely a result of the two concentration fields resulting from ternary diffusion of nickel, copper and iron in the Fe phase. This work is aimed at explaining why nickel causes wavy oxide/liquid-Cu and liquid-Cu/Fe interfaces. Constitutional super-saturation criterion [4] was applied to explain uneven interfaces caused by nickel. A model simulating diffusion behaviors of copper and nickel in Fe was developed by coupling Comsol Multiphysics® and Matlab®. Interface concentrations of copper and nickel and perturbation criterion values were calculated as a function of time. Modeling results show that (i) the nickel interface concentration first increases to a peak value then decreases slowly during oxidation process as a result of the change in oxidation rates, and (ii) the alloys with higher nickel contents have more potential for interface breakdown and this occurs within the initial linear oxidation regime.

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Fujii, Nobutoshi, Shunsuke Furuse, Hirotaka Yoshioka, Naoki Ogawa, Taichi Yamada, Takaaki Hirano, Suguru Saito, Yoshiya Hagimoto e Hayato Iwamoto. "(Invited) Bonding Strength of Cu-Cu Hybrid Bonding for 3D Integration Process". ECS Transactions 112, n.º 3 (29 de setembro de 2023): 3–14. http://dx.doi.org/10.1149/11203.0003ecst.

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Cu-Cu hybrid bonding is a significant technology for fabricating 3D stacked semiconductor devices. In hybrid bonding, the calculation of bonding strength is complex due to the various materials present in the bonding interface. This interface not only includes Cu/Cu and dielectric/dielectric interfaces, but also the Cu/dielectric interface because of the misalignment of Cu pads. In this study, we developed an integrated model regarding total bonding strength, considering the different interfaces. Additionally, considering the thermal expansion of Cu pads, we demonstrated the dependence of bonding strength on misalignment using simulations. At the dielectric/dielectric bonding interface, a phenomenon was observed, in which the H2O contained in the dielectric enhanced the bonding strength. We proposed a model for the increase of the bonding strength by filling the bonding interface gap with thermally expanded dielectrics. These results provide understanding regarding a part of the mechanism involved in bonding strength in Cu-Cu hybrid bonding.

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Korpan, Lidiya. "Cultural Phenomenon Attributes in the Graphic User Interface Design". Vestnik Volgogradskogo gosudarstvennogo universiteta. Serija 7. Filosofiya. Sociologiya i socialnye tehnologii, n.º 1 (maio de 2016): 130–36. http://dx.doi.org/10.15688/jvolsu7.2016.1.17.

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Kushwaha, R. L., e J. Shen. "Numeric Simulation of Friction Phenomenon at Soil-Tool Interface". Tribology Transactions 38, n.º 2 (janeiro de 1995): 424–30. http://dx.doi.org/10.1080/10402009508983424.

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Teses / dissertações sobre o assunto "Interface phenomenon"

Ramos, Roberto Luiz da Cunha Barroso. "Aeroservoelastic analysis of the blade-sailing phenomenon in the helicopter-ship dynamic interface". Instituto Tecnológico de Aeronáutica, 2007. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=368.

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This thesis proposes a Rotary-Wing Aeroservoelasticity approach to the modeling, analysis and control of the blade-sailing phenomenon in the helicopter-ship dynamic interface (DI), based on the identification, response evaluation and control of flow and ship motion induced loads, during the engagement/disengagement flight regimes, in order to establish some principles for the design and safe operation of shipboard rotorcraft systems. The nonlinear aeroelastic analysis revealed that the nonlinearity due to large flapping deflections and to the centrifugal forces is not relevant for normal operating conditions, whereas the nonlinear effects due to the flapping stops in articulated rotors influence significantly the blade-sailing vibrations. These nonlinear effects related to the stops can be tackled with approximate stiffness functions. The nonlinear analysis confirmed that hingeless rotor blade-sailing vibrations are lower than that of the articulated rotor, however, the differences are small for rotors with similar structural/geometric characteristics. The blade-sailing phenomenon in the DI and the flapping response during engagement/disengagement shipboard operations can be analyzed trough an oscillator system with nonlinear stiffness related to the droop and flap stops and time-varying coefficients related to the undisturbed flow velocity and to the parameters of the proposed active proportional-derivative individual blade control (PD-IBC). The aeroelastic analysis also showed that blade sailing is a cooperative phenomenon. Though the mean flow vertical velocity gradient across the rotor be the single most important factor, the combination of horizontal wind velocities, fluctuating flow vertical velocities, gravity and ship motion effects may give rise to excessive flapping vibrations. The proposed active proportional-derivative state feedback individual blade control (PD-IBC) can obtain blade-sailing flapping vibration reduction of 30% for shipboard articulated rotors at moderate wind-over-deck (WOD) conditions/advance ratios, without monitoring the DI environment, and a reduction greater than 40% if combined with shipboard rotor plant modifications, involving an increase of the blade flapwise stiffness and an aerodynamic design of the ship flight deck, considering the current blade pitch input limits of the actuators. Therefore, the implementation of active feedback aeroelastic control methods may be one of the most important measures for blade-sailing mitigation in the DI.

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Bunting, I. "An ethnographic study of the development interface : knowledge, power, culture and the phenomenon of the development community". Thesis, Swansea University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636175.

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This study is an analytical description of the process of Development Intervention. It is facilitated by way of a historiography of intervention in Tanzania, an analysis of development discourse and an ethnography of the development interface, i.e. "the space of contact" between that set of institutional relationships, programmes, mechanisms, methods and ideology that constitute the development apparatus. It is an ethnography of the interface between development assistance agencies, local bureaucracies, and indigenous communities. I have structured the work in three parts. (1) An ethnographic survey and analysis of the development assistance community. I have recorded the experiences and responses from persons from persons engaged in the development interface. It is informed by observations of behaviour within the development interface. This I have done by improvising with a concept of "An Observing Participant". (2) The second part explores the theoretical aspects of development intervention and the nature of cross-cultural encounter it generates. The social construction of meaning in development discourses and the power-knowledge nexus is central to my analysis of the socio-cultural, psychological implications of development intervention in Africa. (3) The third part of the study is reflexive whereby I look at the Socio-economic and cultural heritage of interpretative social science in the context of imperialism and locating myself as an observing participant in the development drama. I provide insights into the power relations and cultural manifestations of development programmes on indigenous institutional capacity and reformation in the dominated but resisting communities of Africa. It highlights and describes processes in which ideas, technologies and institutions are engaged, the ideology infusing these engagements and the effects of this on cultural change together with the individuals and different cultural groups engaged and affected.

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Seth, Umesh Kumar. "Message Passing Interface parallelization of a multi-block structured numerical solver. Application to the numerical simulation of various typical Electro-Hydro-Dynamic flows". Thesis, Poitiers, 2019. http://www.theses.fr/2019POIT2264/document.

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Plusieurs types d’applications industrielles complexes, relèvent du domaine multidisciplinaire de l’Electro-Hydro-Dynamique (EHD) où les interactions entre des particules chargées et des particules neutres sont étudiées dans le contexte couplé de la dynamique des fluides et de l’électrostatique. Dans cette thèse, nous avons étudié par voie de simulation numérique certains phénomènes Electro-Hydro-Dynamiques comme l’injection unipolaire, le phénomène de conduction dans les liquides peu conducteurs et le contrôle d’écoulement avec des actionneurs plasma à barrières diélectriques (DBD). La résolution de tels systèmes physiques complexes exige des ressources de calculs importantes ainsi que des solveurs CFD parallèles dans la mesure où ces modèles EHD sont mathématiquement raides et très consommateurs en temps de calculs en raison des gammes d’échelles de temps et d’espace impliquées. Cette thèse vise à accroitre les capacités de simulations numériques du groupe Electro-Fluido-Dynamique de l’Institut Pprime en développant un solveur parallèle haute performance basé sur des modèles EHD avancés. Dans une première partie de cette thèse, la parallélisation de notre solveur EHD a été réalisée avec des protocoles MPI avancés comme la topologie Cartésienne et les Inter-communicateurs. En particulier, une stratégie spécifique a été conçue pour prendre en compte la caractéristique multi-blocs structurés du code. La nouvelle version parallèle du code a été entièrement validée au travers de plusieurs benchmarks. Les tests de scalabilité menés sur notre cluster de 1200 cœurs ont montré d’excellentes performances. La deuxième partie de cette thèse est consacrée à la simulation numérique de plusieurs écoulements EHD typiques. Nous nous sommes intéressés entre autres à l’électroconvection induite par l'injection unipolaire entre deux électrodes plates parallèles, à l’étude des panaches électroconvectifs dans une configuration d'électrodes lame-plan, au mécanisme de conduction basé sur la dissociation de molécules neutres d'un liquide faiblement conducteur. Certains de ces nouveaux résultats ont été validés avec des simulations numériques entreprises avec le code commercial Comsol. Enfin, le contrôle d’écoulements grâce à un actionneur DBD a été simulé à l’aide du modèle Suzen-Huang dans diverses configurations. Les effets de l’épaisseur du diélectrique, de l’espacement inter-électrodes, de la fréquence de la tension appliquée et sa forme d’onde, sur la vitesse maximale du vent ionique induit ainsi que sur la force électrique moyenne ont été étudiés
Several intricately coupled applications of modern industries fall under the multi-disciplinary domain of Electrohydrodynamics (EHD), where the interactions among charged and neutral particles are studied in context of both fluid dynamics and electrostatics together. The charge particles in fluids are generated with various physical mechanisms, and they move under the influence of external electric field and the fluid velocity. Generally, with sufficient electric force magnitudes, momentum transfer occurs from the charged species to the neutral particles also. This coupled system is solved with the Maxwell equations, charge transport equations and Navier-Stokes equations simulated sequentially in a common time loop. The charge transport is solved considering convection, diffusion, source terms and other relevant mechanisms for species. Then, the bulk fluid motion is simulated considering the induced electric force as a source term in the Navier-Stokes equations, thus, coupling the electrostatic system with the fluid. In this thesis, we numerically investigated some EHD phenomena like unipolar injection, conduction phenomenon in weakly conducting liquids and flow control with dielectric barrier discharge (DBD) plasma actuators.Solving such complex physical systems numerically requires high-end computing resources and parallel CFD solvers, as these large EHD models are mathematically stiff and highly time consuming due to the range of time and length scales involved. This thesis contributes towards advancing the capability of numerical simulations carried out within the EFD group at Institut Pprime by developing a high performance parallel solver with advanced EHD models. Being the most popular and specific technology, developed for the distributed memory platforms, Message Passing Interface (MPI) was used to parallelize our multi-block structured EHD solver. In the first part the parallelization of our numerical EHD solver with advanced MPI protocols such as Cartesian topology and Inter-Communicators is undertaken. In particular a specific strategy has been designed and detailed to account for the multi-block structured grids feature of the code. The parallel code has been fully validated through several benchmarks, and scalability tests carried out on up to 1200 cores on our local cluster showed excellent parallel speed-ups with our approach. A trustworthy database containing all these validation tests carried out on multiple cores is provided to assist in future developments. The second part of this thesis deals with the numerical simulations of several typical EHD flows. We have examined three-dimensional electroconvection induced by unipolar injection between two planar-parallel electrodes. Unsteady hexagonal cells were observed in our study. 3D flow phenomenon with electro-convective plumes was also studied in the blade-plane electrode configuration considering both autonomous and non-autonomous injection laws. Conduction mechanism based on the dissociation of neutral molecules of a weakly conductive liquid has been successfully simulated. Our results have been validated with some numerical computations undertaken with the commercial code Comsol. Physical implications of Robin boundary condition and Onsager effect on the charge species were highlighted in electro-conduction in a rectangular channel. Finally, flow control using Dielectric Barrier Discharge plasma actuator has been simulated using the Suzen-Huang model. Impacts of dielectric thickness, gap between the electrodes, frequency and waveform of applied voltage etc. were investigated in terms of their effect on the induced maximum ionic wind velocity and average body force. Flow control simulations with backward facing step showed that a laminar flow separation could be drastically controlled by placing the actuator at the tip of the step with both electrodes perpendicular to each other

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Li, Hao. "Approche multi-échelle pour les écoulements polyphasiques en présence de phénomènes interfaciaux". Electronic Thesis or Diss., Université de Lorraine, 2024. http://www.theses.fr/2024LORR0081.

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Les phénomènes interfaciaux suscitent un intérêt croissant dans divers domaines industriels et fondamentaux tels que les industries pétrolière, alimentaire, cosmétique ou l'imprimerie, etc. Cette thèse se concentre particulièrement sur les phénomènes impliquant des gouttes et des bulles, notamment leur coalescence, étalement, drainage et éclatement dans des fluides non newtoniens. Plusieurs méthodes expérimentales ont été utilisées, incluant un système d'acquisition électrique DC ultra-rapide, une caméra rapide et un micro-PIV à grande vitesse. La première partie de l'étude explore le contact initial et l'étalement (coalescence) d'une goutte non newtonienne sur une surface solide ou liquide. L'évolution de la conductance électrique, en corrélation avec la largeur d'étalement de la goutte, a été détectée dans les premières microsecondes. L'étalement d'une dispersion opaque de nanoparticules a été entrepris, révélant les mécanismes sous-jacents et les régimes par une loi d’échelle sans dimension. La quantification des champs de vitesse à l'intérieur de la goutte a également été réalisée. La deuxième partie compare la durée de vie et l'éclatement d'une bulle unique à différentes surfaces liquides, y compris celles chargées de particules superhydrophobes. L'épaisseur de la calotte de la bulle a été mesurée grâce à l'imagerie à grande vitesse. Les champs de vitesse autour de la cavité de bulle ont été mesurés, montrant le rôle de la couche de particules et la viscoélasticité des fluides dans la transition d'une rupture rapide à une disparition lente de la bulle. Enfin, la troisième partie examine la coalescence d'une goutte non newtonienne avec une phase liquide de la même nature à travers des interfaces air-liquide chargées de particules. Les champs de vitesse au sein de la goutte et dans le liquide ont été évalués, et une analyse du signal électrique a mis en évidence la différence avec la coalescence à des surfaces sans particules. Le rôle complexe de la couche de particules comme barrière et pont a été dévoilé, ainsi que sa relation avec la viscoélasticité du fluide
Interfacial phenomena as a research domain have attracted focus and resources from areas of industrial and fundamental interests: cosmetics, printing, food industries, and glass productions, etc. What charms the defender most is the phenomena with drops and bubbles - their processes of coalescing, spreading, draining, and bursting - involving non-Newtonian fluids. Multiple experimental methods such as ultra-high-speed DC electrical acquisition system, high-speed camera and high-speed micro-PIV were jointly adopted for the investigation. The first part focused on experimental research on initial contact and spreading (coalescing) of a non-Newtonian drop on a solid (liquid) planar surface. The evolution of the electrical conductance in close relation with the drop spreading (coalescing) width was detected at first microseconds. Spreading (coalescing) behaviors of an opaque dispersion of nanoparticles was examined. Regimes and mechanism behind were revealed via dimensionless scaling. The quantification of flow fields inside a spreading (coalescing) drop was performed. The second part comparatively investigated the lifetime and bursting behavior of a single bubble at different liquid surfaces and through particle-laden liquid surfaces. Bubble cap thickness was quantitatively compared based on the high-speed imaging results. Velocity fields and profiles around bubble cavity were drafted and analyzed. The role of particle layer, together with fluids’ viscoelasticity, was confirmed in the shift for a bubble from a quick rupture death to a slow shrinking disappearance. The last part studied the coalescence of a non-Newtonian drop with its bulk phase through particle-laden air-liquid surfaces. A characteristic evaluation of speed fields within the drop and the bulk was conducted. An electrical signal analysis was carried out to highlight the difference with the coalescence of a drop with particle-free surfaces. The complicate role of particle layer as a barrier and bridge at the same time was confirmed and its relationship with fluid’s viscoelasticity was demonstrated

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Bao, Qinye. "Interface Phenomena in Organic Electronics". Doctoral thesis, Linköpings universitet, Ytors Fysik och Kemi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-118922.

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Organic electronics based on organic semiconductors offer tremendous advantages compared to traditional inorganic counterparts such as low temperature processing, light weight, low manufacturing cost, high throughput and mechanical flexibility. Many key electronic processes in organic electronic devices, e.g. charge injection/extraction, charge recombination and exciton dissociation, occur at interfaces, significantly controlling performance and function. Understanding/modeling the interface energetics at organic-electrode/organic-organic heterojunctions is one of the crucial issues for organic electronic technologies to provide a route for improving device efficiency, which is the aim of the research presented in this thesis. Integer charge transfer (ICT) states pre-existed in the dark and created as a consequence of Fermi level equilibrium at donor-acceptor interface have a profound effect on open circuit voltage in organic bulk heterojunction photovoltaics. ICT state formation causes vacuum level misalignment that yields a roughly constant effective donor ionization potential to acceptor electron affinity energy difference at the donor-acceptor interface, even though there is a large variation in electron affinity for the fullerene series. The large variation in open circuit voltage for the corresponding device series instead is found to be a consequence of trap-assisted recombination via integer charge transfer states. Based on the results, novel design rules for optimizing open circuit voltage and performance of organic bulk heterojunction solar cells are proposed. Doping and insertion of interlayer are two established methods for enhancing charge injection/extraction properties at organic-electrode interface. By studying the energy level alignment behavior at low to intermediate doping levels for molecule-doped conjugated polymer/electrode interfaces, we deduce that two combined processes govern the interface energetics: (i) equilibration of the Fermi level due to oxidation (or reduction) of polymer sites at the interface as per the ICT model and (ii) a double dipole step induced by image charge from the dopant-polymer charge transfer complex that causes a shift of the work function. Such behavior is expected to hold in general for low to intermediate level doped organic semiconductor systems. The unified model is further extended to be suitable for conjugated electrolyte/electrode interfaces, revealing the design rules for achieving the smallest charge injection/extraction barrier for both thin tunneling and thick charge transporting conjugated electrolyte interlayers. To probe into the energy level spatial extension at interfaces, we employ the original approach of building and characterizing multilayers composed of a well-defined number of polymer monolayers with the Langmuir-Shäfer method to control polymer film uniformity and thicknesses, avoiding the problems associated with spin-coating ultrathin films. The disordered/amorphous films feature smaller, and in fact negligible, energy level bending compared to the more well-ordered films, in contradiction with existing models. It is found that that energy level bending depends on the ICT state distribution rather than the density of states of the neutral polymer chains in relation to the Fermi energy, thus taking into account the Coulomb energy associated with charging the polymer chain and transferring a charge across the interface. Based on this work, a general model for energy level bending in absence of significant doping of conjugated polymer films is proposed. Organic semiconductors are sensitive to ambient atmosphere that can influence the energetics. The degradation effects of common PCBM film induced by oxygen and water are found to be completely different. Upon exposure to oxygen, the work function is down-shifted by ~ 0.15 eV compared to the ICT curve of the pristine PCBM film, originating from the weak interaction between the fullerene part of PCBM and oxygen, and this can be reversed by thermal treatment in vacuum. The down-shift in energetics will cause a loss in open circuit voltage at electrode interface, but aids free charge generation at donor-acceptor interface. Upon exposure to water, there is irreversible extensive broadening and bleaching of the valence electronic structure features as well as a substantial decrease of work function and ionization potential, severely degrading the transport properties. Overall, the research results in this thesis thus give a deeper understanding of interface phenomena in organic electronics, especially regard to organic solar cells, aimed to further improve the device operation efficiency and lifetime.

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Villanueva, Walter. "Diffuse-Interface Simulations of Capillary Phenomena". Doctoral thesis, Stockholm : Kungl. tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4402.

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Zahedi, Sara. "Numerical Modeling of Fluid Interface Phenomena". Licentiate thesis, Stockholm : Skolan för datavetenskap och kommunikation, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10507.

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Wheale, Samantha Hilary. "Physicochemical phenomena at the plasma-polymer interface". Thesis, Durham University, 1997. http://etheses.dur.ac.uk/4977/.

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Non-isothennal plasma modification of polymer surfaces is of scientific and technological interest, since it can be used to improve wettability, adliesion, etc. This thesis covers three main areas, firstly a study of the processes occuixing at the plasma - polymer interface using a newly developed technique, secondly the fluorination of polymer surfaces using a novel transportable reagent and lastly the oxidation of rubber substrates. The interaction of N(_2), O(_2), air and H(_2) glow discharges with polyethylene surfaces has been studied using a newly developed mass spectrometric technique. The species permeating through to the reverse side of the polymer substrate can be detected and characterised. Compared to previously reported approaches, this method is capable of sampling reaction products within closer proximity to the plasma - polymer interface, thereby circumventing the complication of primary product species undergoing secondary processes within the bulk of the electrical discharge prior to detection. The nature of the feed gas is found to strongly influence the chemical reaction pathways occurring at the plasma - polymer interface. Xenon difluoride (XeF(_2)) plasma treatment of a series of polymers containing different repeat units gives rise to surface fluorination. A comparison with CF(_4) plasma modification shows that XeF(_2) electrical discharges are more effective at fluorinating polymers. The extent of fluorine incorporation can be accounted for in terms of a structure-behaviour relationship derived from extended Huckel molecular orbital calculations. Exposure of polyethylene and polystyrene to xenon difluoride (XeF(_2)) in the presence of vacuum ultraviolet (VUV) irradiation also causes surface fluorination. The extent of reaction is found to depend upon the VUV absorption characteristics of the XeF(_2) feed gas as well as those of the polymer substrate. Low pressure glow discharge, dielectric barrier discharge and ozone treatments all oxidise additive-free rubber substrates. The oxidation susceptibility of the rubber substrates differed during all three treatments, and was found to be dependent upon the concentration of unsaturated carbons, saturated carbons and phenyl rings. The additives placed ill rubbers to improve properties such as tear resistance influence their degree of oxidation.

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Quinn, Amy May. "The study of contact phenomena using ultrasound". Thesis, University of Bristol, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271847.

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Chiu, Patrick Y. "Computational modeling of atomistic phenomena at the interface". [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0024892.

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Mais fontes

Livros sobre o assunto "Interface phenomenon"

Blake, J. R., J. M. Boulton-Stone e N. H. Thomas, eds. Bubble Dynamics and Interface Phenomena. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0938-3.

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F, Hewitt G., Mayinger F. 1931-, Riznic J e International Center for Heat and Mass Transfer., eds. Phase-interface phenomena in multiphase flow. New York: Hemisphere Pub. Corp., 1991.

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Valerii, Cheshkov, e Natova Margarita, eds. Polymer composite materials: Interface phenomena & processes. Dordrecht: Kluwer Academic Publishers, 2001.

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Ivanov, Yatchko, Valerii Cheshkov e Margarita Natova. Polymer Composite Materials — Interface Phenomena & Processes. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-9664-5.

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Sellers, Harrell Lee, e Joseph Thomas Golab, eds. Theoretical and Computational Approaches to Interface Phenomena. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4899-1319-7.

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Dosch, Helmut, ed. Critical Phenomena at Surfaces and Interfaces. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/bfb0045209.

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Kryukov, Alexei, Vladimir Levashov e Yulia Puzina. Non-Equilibrium Phenomena near Vapor-Liquid Interfaces. Heidelberg: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00083-1.

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Nizzoli, Fabrizio, Karl-Heinz Rieder e Roy F. Willis, eds. Dynamical Phenomena at Surfaces, Interfaces and Superlattices. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82535-4.

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1944-, Wandelt K., e Thurgate S. 1952-, eds. Solid-liquid interfaces: Macroscopic phenomena, microscopic understanding. Berlin: Springer, 2003.

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D, Beysens, Boccara Nino, Forgács G e Centre de physique des Houches, eds. Dynamical phenomena at interfaces, surfaces and membranes. Commack, N.Y: Nova Science Publishers, 1993.

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Mais fontes

Capítulos de livros sobre o assunto "Interface phenomenon"

Tiskin, Daniel. "Intentional Identity as a Transparency Phenomenon". In Pronouns in Embedded Contexts at the Syntax-Semantics Interface, 43–73. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56706-8_2.

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Liu, Yaohui, Zhenming He, Sirong Yu e Qingchun Li. "Interface Phenomenon between Al2O3/ A1—4.5Cu—Ce Alloy Compositeo①". In MICC 90, 485–90. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3676-1_83.

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Hubaut, R., A. Rives, O. Lapina, D. Khabilulin e C. E. Scott. "Synergy Phenomenon in Bulk Ruthenium- Vanadium sulfides : 51V NMR and ESR studies". In Magnetic Resonance in Colloid and Interface Science, 531–36. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0534-0_50.

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Bamyacı, Elif. "Measuring Animacy Effects on Verb Number Marking: A Semantics-Morphosyntax Interface Phenomenon". In Competing Structures in the Bilingual Mind, 75–114. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-22991-1_5.

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Bamyacı, Elif. "Measuring Effects of Topicality on Verb Number Marking: A Pragmatics-Morphosyntax Interface Phenomenon". In Competing Structures in the Bilingual Mind, 115–53. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-22991-1_6.

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Du, Meifang. "The Research on Fishery Metadata in Bohai Sea Based on Semantic Web". In Proceeding of 2021 International Conference on Wireless Communications, Networking and Applications, 234–40. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2456-9_25.

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AbstractIn this paper, a data sharing and management mechanism suitable for the characteristics of fishery industry was established to clarify the phenomenon of heterogeneous Web data and Information Island based on Semantic Web technology, and unified interface specification information platform was established. Form the specification of metadata from the physical and chemical database, developing and publishing the corresponding metadata management tool, assisting, assisting and guiding a specialized database centre, completing the construction of metadata from the professional database.

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Prud’homme, Roger. "Interface Phenomena". In Flows of Reactive Fluids, 333–64. Boston: Birkhäuser Boston, 2010. http://dx.doi.org/10.1007/978-0-8176-4659-2_11.

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Kondoh, Katsuyoshi, Nozomi Nakanishi, Rei Takei e Junko Umeda. "Effect of Reacted Layer on Galvanic Corrosion Phenomenon at Interface Between Ti Dispersion and Mg-Al Alloy". In Supplemental Proceedings, 93–100. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062173.ch11.

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Miyamae, Takayuki, e Kouki Akaike. "Analysis of Molecular Surface/Interfacial Layer by Sum-Frequency Generation (SFG) Spectroscopy". In Interfacial Phenomena in Adhesion and Adhesive Bonding, 291–360. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-4456-9_5.

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AbstractThis chapter reviews recent progress in polymer surfaces and interface studies using sum-frequency generation (SFG) vibrational spectroscopy. SFG is a surface-specific vibrational spectroscopic technique that has spread on a worldwide scale since it was first reported in 1987. The SFG principles, instruments, techniques, and experiments are presented in detail, and recent results on interfacial physics and chemistry at jointed interfaces are described. It focuses on SFG studies of the surfaces and buried interfaces of polymeric materials, such as modification of polymer surfaces, polymer-water, polymer-metal, and polymer–polymer interfaces. This review demonstrates that SFG is a powerful technique for nondestructive, in situ measurement of molecular level understanding at complex polymer surfaces and interfaces.

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Chierchia, Gennaro, Danny Fox e Benjamin Spector. "10. Scalar implicature as a grammatical phenomenon". In Semantics - Interfaces, editado por Claudia Maienborn, Klaus Heusinger e Paul Portner, 325–67. Berlin, Boston: De Gruyter, 2019. http://dx.doi.org/10.1515/9783110589849-010.

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Trabalhos de conferências sobre o assunto "Interface phenomenon"

Landis, Christopher, Anna Iskhakova, Yoshiyuki Kondo, Koichi Tanimoto, Nam Dinh e Igor Bolotnov. "Interface Capturing Simulations and Analysis of Boiling Phenomenon in Complex Geometries". In 2024 International Congress on Advances in Nuclear Power Plants (ICAPP), 970–78. Illinois: American Nuclear Society, 2024. http://dx.doi.org/10.13182/t130-44116.

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Favretto-Cristini, N., e E. de Bazelaire. "Amplitude scattering phenomenon - is interface wave propagation guilty?" In EAGE/SEG Research Workshop on Reservoir Rocks - Understanding reservoir rock and fluid property distributions - measurement, modelling and applications. European Association of Geoscientists & Engineers, 2001. http://dx.doi.org/10.3997/2214-4609.201406735.

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Abe, Shinnosuke, Tomohiro Kawashima, Masayuki Nagao, Naohiro Hozumi, Yoshinobu Murakami, Naruto Miyakawa, Hiroki Shiota e Takao Tsurimoto. "Electrical treeing characteristics near multi-layer interface". In 2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP). IEEE, 2017. http://dx.doi.org/10.1109/ceidp.2017.8257487.

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Zainuddin, H., P. M. Mitchinson e P. L. Lewin. "Investigation on the surface discharge phenomenon at the oil-pressboard interface". In 2011 IEEE 17th International Conference on Dielectric Liquids (ICDL). IEEE, 2011. http://dx.doi.org/10.1109/icdl.2011.6015439.

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Suemori, Kouji, Masahiro Hiramoto e Masaaki Yokoyama. "Influence of Oxygen on Photocurrent Multiplication Phenomenon at Organic/Metal Interface". In 2002 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2002. http://dx.doi.org/10.7567/ssdm.2002.c-4-3.

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Li, Chang-Jiu, Wen-Ya Li e H. Fukanuma. "Impact Fusion Phenomenon During Cold Spraying of Zinc". In ITSC2004, editado por Basil R. Marple e Christian Moreau. ASM International, 2004. http://dx.doi.org/10.31399/asm.cp.itsc2004p0335.

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Abstract In the present study, the zinc powder (-48 µm) was used to deposit coating by cold spraying using nitrogen as driving gas at different operating temperatures. The microstructure of the deposited coating was characterized by optical microscopy, scanning electron microscopy and transmission electron microscopy (TEM) to reveal the occurrence of fusion during the impacting of spray particles. The selected area electron diffraction analysis was used to examine the microstructural feature at the near interface areas between the deposited particles in zinc coating. Numerical simulation was carried out to estimate the particle temperature increment during the impacting process. The simulation result suggests a possibility of the melting of zinc particles at the localized contact region on impact. The examination of the coating surface provided the evidence for the occurrence of the melting of spray particles on impact. The experimental results showed that the cold-sprayed zinc coating presented a dense microstructure. The nano-structural phase was formed at the near interface areas between deposited particles in zinc coating, while the grains in the size of micrometers similar to that in the powder were retained in the inside of the particles in the coating. Moreover, the TEM observation evidently showed that the amorphous phase was formed at the interface areas between the particles. It can be considered that the amorphous phase in the coating was formed through subsequent rapid solidification of the melted material on impact. This fact provided further evidence to the occurrence of localized melting during impacting of spray particles.

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Aldawsari, Faisal, Chitral J. Angammana e Shesha H. Jayaram. "Influence of interface on the electrical properties of silicone nanocomposites". In 2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP). IEEE, 2017. http://dx.doi.org/10.1109/ceidp.2017.8257645.

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Favretto-Cristini, Nathalie, e Eric de Bazelaire. "The Role Of Interface Waves And Diffracted Waves In The Amplitude Scattering Phenomenon". In 7th International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 2001. http://dx.doi.org/10.3997/2214-4609-pdb.217.454.

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Liu, Ke. "Simulating the Approach-retract Phenomenon of AFM in Virtual Environment with Haptic Interface". In CAD'15 London. CAD Solutions LLC, 2015. http://dx.doi.org/10.14733/cadconfp.2015.101-106.

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Liu, Ke, e Xiaobo Peng. "Simulating the Approach-retract Phenomenon of AFM in Virtual Environment with Haptic Interface". In CAD'15. CAD Solutions LLC, 2015. http://dx.doi.org/10.14733/cadconfp.2015.89-93.

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Relatórios de organizações sobre o assunto "Interface phenomenon"

Hwang, H. Y. Emergent Phenomena at Oxide Interfaces. Office of Scientific and Technical Information (OSTI), fevereiro de 2012. http://dx.doi.org/10.2172/1035095.

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Furtak, T. E. Potential modulation of equilibrium and excitation phenomena at the electrolyte-solid interface. Office of Scientific and Technical Information (OSTI), outubro de 1991. http://dx.doi.org/10.2172/6250728.

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Arnoldus, Henk F., e Thomas F. George. Interference Phenomena in Atomic Emission Near an Interface: Pure Classical Effects in Quantum Radiation. Fort Belvoir, VA: Defense Technical Information Center, março de 1989. http://dx.doi.org/10.21236/ada206700.

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Gray, Alexander. Final Technical Report - Emergent Phenomena at Mott Interfaces – a Time- and Depth-Resolved Approach. Office of Scientific and Technical Information (OSTI), abril de 2024. http://dx.doi.org/10.2172/2335705.

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Furtak, T. E. Potential modulation of equilibrium and excitation phenomena at the electrolyte-solid interface. [Second harmonic generation; interfacial optical spectroscopy]. Office of Scientific and Technical Information (OSTI), outubro de 1992. http://dx.doi.org/10.2172/7204420.

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Lu, Ping. In-situ Study of Dynamic Phenomena at Metal Nanosolder Interfaces Using Aberration Corrected Scanning Transmission Electron Microcopy. Office of Scientific and Technical Information (OSTI), outubro de 2014. http://dx.doi.org/10.2172/1159665.

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Furtak, T. E. Potential modulation of equilibrium and excitation phenomena at the electrolyte-solid interface. Progress report, October 31, 1991--September 30, 1992. Office of Scientific and Technical Information (OSTI), outubro de 1992. http://dx.doi.org/10.2172/10182768.

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Shmulevich, Itzhak, Shrini Upadhyaya, Dror Rubinstein, Zvika Asaf e Jeffrey P. Mitchell. Developing Simulation Tool for the Prediction of Cohesive Behavior Agricultural Materials Using Discrete Element Modeling. United States Department of Agriculture, outubro de 2011. http://dx.doi.org/10.32747/2011.7697108.bard.

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The underlying similarity between soils, grains, fertilizers, concentrated animal feed, pellets, and mixtures is that they are all granular materials used in agriculture. Modeling such materials is a complex process due to the spatial variability of such media, the origin of the material (natural or biological), the nonlinearity of these materials, the contact phenomenon and flow that occur at the interface zone and between these granular materials, as well as the dynamic effect of the interaction process. The lack of a tool for studying such materials has limited the understanding of the phenomena relevant to them, which in turn has led to energy loss and poor quality products. The objective of this study was to develop a reliable prediction simulation tool for cohesive agricultural particle materials using Discrete Element Modeling (DEM). The specific objectives of this study were (1) to develop and verify a 3D cohesionless agricultural soil-tillage tool interaction model that enables the prediction of displacement and flow in the soil media, as well as forces acting on various tillage tools, using the discrete element method; (2) to develop a micro model for the DEM formulation by creating a cohesive contact model based on liquid bridge forces for various agriculture materials; (3) to extend the model to include both plastic and cohesive behavior of various materials, such as grain and soil structures (e.g., compaction level), textures (e.g., clay, loam, several grains), and moisture contents; (4) to develop a method to obtain the parameters for the cohesion contact model to represent specific materials. A DEM model was developed that can represent both plastic and cohesive behavior of soil. Soil cohesive behavior was achieved by considering tensile force between elements. The developed DEM model well represented the effect of wedge shape on soil behavior and reaction force. Laboratory test results showed that wedge penetration resistance in highly compacted soil was two times greater than that in low compacted soil, whereas DEM simulation with parameters obtained from the test of low compacted soil could not simply be extended to that of high compacted soil. The modified model took into account soil failure strength that could be changed with soil compaction. A three dimensional representation composed of normal displacement, shear failure strength and tensile failure strength was proposed to design mechanical properties between elements. The model based on the liquid bridge theory. An inter particle tension force measurement tool was developed and calibrated A comprehensive study of the parameters of the contact model for the DEM taking into account the cohesive/water-bridge was performed on various agricultural grains using this measurement tool. The modified DEM model was compared and validated against the test results. With the newly developed model and procedure for determination of DEM parameters, we could reproduce the high compacted soil behavior and reaction forces both qualitatively and quantitatively for the soil conditions and wedge shapes used in this study. Moreover, the effect of wedge shape on soil behavior and reaction force was well represented with the same parameters. During the research we made use of the commercial PFC3D to analyze soil tillage implements. An investigation was made of three different head drillers. A comparison of three commonly used soil tillage systems was completed, such as moldboard plow, disc plow and chisel plow. It can be concluded that the soil condition after plowing by the specific implement can be predicted by the DEM model. The chisel plow is the most economic tool for increasing soil porosity. The moldboard is the best tool for soil manipulation. It can be concluded that the discrete element simulation can be used as a reliable engineering tool for soil-implement interaction quantitatively and qualitatively.

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Donner, Sebastian. Development of Carbon Based optically Transparent Electrodes from Pyrolyzed Photoresist for the Investigation of Phenomena at Electrified Carbon-Solution Interfaces. Office of Scientific and Technical Information (OSTI), janeiro de 2007. http://dx.doi.org/10.2172/933140.

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Perdigão, Rui A. P. Earth System Dynamic Intelligence with Quantum Technologies: Seeing the “Invisible”, Predicting the “Unpredictable” in a Critically Changing World. Meteoceanics, outubro de 2021. http://dx.doi.org/10.46337/211028.

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We hereby embark on a frontier journey articulating two of our flagship programs – “Earth System Dynamic Intelligence” and “Quantum Information Technologies in the Earth Sciences” – to take the pulse of our planet and discern its manifold complexity in a critically changing world. Going beyond the traditional stochastic-dynamic, information-theoretic, artificial intelligence, mechanistic and hybrid approaches to information and complexity, the underlying fundamental science ignites disruptive developments empowering complex problem solving across frontier natural, social and technical geosciences. Taking aim at complex multiscale planetary problems, the roles of our flagships are put into evidence in different contexts, ranging from I) Interdisciplinary analytics, model design and dynamic prediction of hydro-climatic and broader geophysical criticalities and extremes across multiple spatiotemporal scales; to II) Sensing the pulse of our planet and detecting early warning signs of geophysical phenomena from Space with our Meteoceanics QITES Constellation, at the interface between our latest developments in non-linear dynamics and emerging quantum technologies.

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