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Letteratura scientifica selezionata sul tema "Interface potential"

Autore: Grafiati

Pubblicato: 21 dicembre 2024

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Articoli di riviste sul tema "Interface potential"

De Keyser, J., e M. Echim. "Electric potential differences across auroral generator interfaces". Annales Geophysicae 31, n. 2 (19 febbraio 2013): 251–61. http://dx.doi.org/10.5194/angeo-31-251-2013.

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Abstract. Strong localized high-altitude auroral electric fields, such as those observed by Cluster, are often associated with magnetospheric interfaces. The type of high-altitude electric field profile (monopolar, bipolar, or more complicated) depends on the properties of the plasmas on either side of the interface, as well as on the total electric potential difference across the structure. The present paper explores the role of this cross-field electric potential difference in the situation where the interface is a tangential discontinuity. A self-consistent Vlasov description is used to determine the equilibrium configuration for different values of the transverse potential difference. A major observation is that there exist limits to the potential difference, beyond which no equilibrium configuration of the interface can be sustained. It is further demonstrated how the plasma densities and temperatures affect the type of electric field profile in the transition, with monopolar electric fields appearing primarily when the temperature contrast is large. These findings strongly support the observed association of monopolar fields with the plasma sheet boundary. The role of shear flow tangent to the interface is also examined.

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Tonegawa, Yoshihiro. "Phase field model with a variable chemical potential". Proceedings of the Royal Society of Edinburgh: Section A Mathematics 132, n. 4 (agosto 2002): 993–1019. http://dx.doi.org/10.1017/s0308210500001980.

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We study some asymptotic behaviour of phase interfaces with variable chemical potential under the uniform energy bound. The problem is motivated by the Cahn-Hilliard equation, where one has a control of the total energy and chemical potential. We show that the limit interface is an integral varifold with generalized Lp mean curvature. The convergence of interfaces as 0 is in the Hausdorff distance sense.

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Korociński, A., e M. Napiórkowski. "Capillary interface potential and interfacial fluctuations". Molecular Physics 84, n. 1 (gennaio 1995): 171–84. http://dx.doi.org/10.1080/00268979500100131.

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Nag, B. R., e Madhumita Das. "Scattering potential for interface roughness scattering". Applied Surface Science 182, n. 3-4 (ottobre 2001): 357–60. http://dx.doi.org/10.1016/s0169-4332(01)00448-2.

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Zhang, S. B., Marvin L. Cohen e Steven G. Louie. "Interface potential changes and Schottky barriers". Physical Review B 32, n. 6 (15 settembre 1985): 3955–57. http://dx.doi.org/10.1103/physrevb.32.3955.

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Wolf, Catherine G., e James R. Rhyne. "A Taxonomic Approach to Understanding Direct Manipulation". Proceedings of the Human Factors Society Annual Meeting 31, n. 5 (settembre 1987): 576–80. http://dx.doi.org/10.1177/154193128703100522.

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This paper presents a taxonomy for user interface techniques which is useful in understanding direct manipulation interfaces. The taxonomy is based on the way actions and objects are specified in the interface. We suggest that direct manipulation is a characteristic shared by a number of different interface techniques, rather than a single interface style. A relatively new interface method, gesture, is also described in terms of the taxonomy and some observations are made on its potential.

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Fodor, Milán András, Hannah Herschel, Atilla Cantürk, Gernot Heisenberg e Ivan Volosyak. "Evaluation of Different Visual Feedback Methods for Brain—Computer Interfaces (BCI) Based on Code-Modulated Visual Evoked Potentials (cVEP)". Brain Sciences 14, n. 8 (22 agosto 2024): 846. http://dx.doi.org/10.3390/brainsci14080846.

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Brain–computer interfaces (BCIs) enable direct communication between the brain and external devices using electroencephalography (EEG) signals. BCIs based on code-modulated visual evoked potentials (cVEPs) are based on visual stimuli, thus appropriate visual feedback on the interface is crucial for an effective BCI system. Many previous studies have demonstrated that implementing visual feedback can improve information transfer rate (ITR) and reduce fatigue. This research compares a dynamic interface, where target boxes change their sizes based on detection certainty, with a threshold bar interface in a three-step cVEP speller. In this study, we found that both interfaces perform well, with slight variations in accuracy, ITR, and output characters per minute (OCM). Notably, some participants showed significant performance improvements with the dynamic interface and found it less distracting compared to the threshold bars. These results suggest that while average performance metrics are similar, the dynamic interface can provide significant benefits for certain users. This study underscores the potential for personalized interface choices to enhance BCI user experience and performance. By improving user friendliness, performance, and reducing distraction, dynamic visual feedback could optimize BCI technology for a broader range of users.

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Sun, Qiang, Yan-Nan Chen e Yu-Zhen Liu. "The Effects of External Interfaces on Hydrophobic Interactions I: Smooth Surface". Molecules 29, n. 13 (1 luglio 2024): 3128. http://dx.doi.org/10.3390/molecules29133128.

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External interfaces, such as the air–water and solid–liquid interfaces, are ubiquitous in nature. Hydrophobic interactions are considered the fundamental driving force in many physical and chemical processes occurring in aqueous solutions. It is important to understand the effects of external interfaces on hydrophobic interactions. According to the structural studies on liquid water and the air–water interface, the external interface primarily affects the structure of the topmost water layer (interfacial water). Therefore, an external interface may affect hydrophobic interactions. The effects of interfaces on hydrophobicity are related not only to surface molecular polarity but also to the geometric characteristics of the external interface, such as shape and surface roughness. This study is devoted to understanding the effects of a smooth interface on hydrophobicity. Due to hydrophobic interactions, the solutes tend to accumulate at external interfaces to maximize the hydrogen bonding of water. Additionally, these can be demonstrated by the calculated potential mean forces (PMFs) using molecular dynamic (MD) simulations.

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Héja, László, Ágnes Simon, Zsolt Szabó e Julianna Kardos. "Connexons Coupling to Gap Junction Channel: Potential Role for Extracellular Protein Stabilization Centers". Biomolecules 12, n. 1 (30 dicembre 2021): 49. http://dx.doi.org/10.3390/biom12010049.

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Connexin (Cx) proteins establish intercellular gap junction channels (Cx GJCs) through coupling of two apposed hexameric Cx hemichannels (Cx HCs, connexons). Pre- and post-GJ interfaces consist of extracellular EL1 and EL2 loops, each with three conserved cysteines. Previously, we reported that known peptide inhibitors, mimicking a variety of Cx43 sequences, appear non-selective when binding to homomeric Cx43 vs. Cx36 GJC homology model subtypes. In pursuit of finding potentially Cx subtype-specific inhibitors of connexon-connexon coupling, we aimed at to understand better how the GJ interface is formed. Here we report on the discovery of Cx GJC subtype-specific protein stabilization centers (SCs) featuring GJ interface architecture. First, the Cx43 GJC homology model, embedded in two opposed membrane bilayers, has been devised. Next, we endorsed the fluctuation dynamics of SCs of the interface domain of Cx43 GJC by applying standard molecular dynamics under open and closed cystine disulfide bond (CS-SC) preconditions. The simulations confirmed the major role of the unique trans-GJ SC pattern comprising conserved (55N, 56T) and non-conserved (57Q) residues of the apposed EL1 loops in the stabilization of the GJC complex. Importantly, clusters of SC patterns residing close to the GJ interface domain appear to orient the interface formation via the numerous SCs between EL1 and EL2. These include central 54CS-S198C or 61CS-S192C contacts with residues 53R, 54C, 55N, 197D, 199F or 64V, 191P, respectively. In addition, we revealed that GJC interface formation is favoured when the psi dihedral angle of the nearby 193P residue is stable around 180° and the interface SCs disappear when this angle moves to the 0° to −45° range. The potential of the association of non-conserved residues with SC motifs in connexon-connexon coupling makes the development of Cx subtype-specific inhibitors viable.

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Yamasue, Kohei, e Yasuo Cho. "Surface Potential Fluctuations of SiO<sub>2</sub>/SiC Interfaces Investigated by Local Capacitance-Voltage Profiling Based on Time-Resolved Scanning Nonlinear Dielectric Microscopy". Materials Science Forum 1062 (31 maggio 2022): 335–40. http://dx.doi.org/10.4028/p-2t7zak.

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We investigate surface potential fluctuations on SiO2/SiC interfaces by local capacitance-voltage profiling based on time-resolved scanning nonlinear dielectric microscopy. As experimental indicators of surface potential fluctuations, we measured the spatial fluctuations of local capacitance-voltage and its first derivative profiles through the detection of the voltages at the infection points of the profiles. We show that, even for a sample with a nitrided interface with low interface defect density, the fluctuations of the measured voltages are much higher than the thermal energy at room temperature. This indicates the existence of high potential fluctuations, which can give the significant impacts on the carrier transport at the SiO2/SiC interface of SiC metal-oxide-semiconductor field effect transistors.

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Più fonti

Tesi sul tema "Interface potential"

Pilkington, Mark. "Determination of crustal interface topography from potential fields". Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=71958.

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A method is presented for the determination of interface topography of multi-layered crustal models from gravity or magnetic data. The technique is developed within the framework of discrete linear inverse theory and exploits the quasi-linearity of the problem to derive a simple cost-effective algorithm suitable for use on large gridded data sets.
Variation of auxiliary parameters allows a suite of acceptable models to be produced rapidly and appraised in the light of available geological and geophysical evidence. When independent knowledge concerning the behaviour of specified interfaces is available, the incorporation of such data in the form of linear equality constraints is outlined.
The proposed method is applied to Curie isotherm and Moho mapping in the Abitibi greenstone belt.

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Joscelyne, Simon Mark. "Separations using controlled potential packed beds". Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334876.

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Zheng, Lin. "Étude et caractérisation des interfaces conducteur/isolant par la méthode de l'onde de pression". Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS288.

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Les interfaces entre un conducteur et un isolant sont généralement supposées parfaites, c'est-à-dire que la longueur de Debye dans l'isolant est supposée très grande devant son épaisseur. Il est montré dans ce travail que ce n'est pas le cas et que des états d'interface produisent un potentiel de contact qui peut modifier grandement le comportement de l'interface lorsque le matériau est soumis à un champ électrique intense. En effet le dipôle d'interface à l'origine de la tension d'interface modifie la courbure des bandes d'énergie et donc favorise au au contraire contrarie l'injection ou l'extraction de charges. Une série d'expériences a été réalisée en utilisant la méthode d'onde de pression implémentée à l'aide d'un générateur acoustique de forte puissance sur des échantillons de polyéthylène de différents types, avec différentes électrodes et avec différentes conditions expérimentales. Les dipôles d'interface observés par la mesure influent effectivement sur l'injection de charges lorsque le matériau est sous haute tension. On peut remarquer que l'aluminium a une influence plus importante, notamment lorsqu'il est utilisé avec de l'huile silicone. Lorsque l'isolant ne possède pas d'électrodes, il est préférable de le coupler directement à un polymère chargé en carbone avec de l'huile silicone plutôt que de lui déposer des électrodes sous vide. Le dipôle d'interface observé est en effet plus proche de celui observé avec des électrodes en polymère chargé en carbone collées à chaud. Lors de la mise sous tension, on remarque que les charges pénètrent d'abord dans l'échantillon du fait du dipôle d'interface. La migration de ces charges produisent alors des injections secondaires dues à un effet de champ. La fluoration de la surface des échantillons n'a pas significativement amélioré la situation et n'opère donc pas comme un rempart aux charges, mais plutôt comme une barrière à la diffusion d'impuretés
The interfaces between a conductor and an insulator are generally assumed to be perfect, meaning that the Debye length in the insulator is considered to be much larger than its thickness. However, this work shows that this is not the case and that interface states generate a contact potential that can significantly alter the behavior of the interface when the material is subjected to a strong electric field. Indeed, the interface dipole responsible for the interface voltage modifies the curvature of the energy bands and thus either promotes or hinders charge injection or extraction. A series of experiments was conducted using the pressure wave method, implemented with a high-power acoustic generator on various polyethylene samples, with different electrodes and under various experimental conditions. The interface dipoles observed through measurement do indeed influence charge injection when the material is under high voltage. It is noteworthy that aluminum has a greater influence, particularly when used with silicone oil. When the insulator does not have electrodes, it is preferable to directly couple it with a carbon-filled polymer and silicone oil rather than deposit electrodes on it under vacuum. The interface dipole observed is indeed closer to that seen with carbon-filled polymer electrodes hot-bonded to the material. Upon applying voltage, charges initially penetrate the sample due to the interface dipole. The migration of these charges then leads to secondary injections caused by a field effect. Fluorinating the surface of the samples did not significantly improve the situation and thus does not act as a shield against charges, but rather as a barrier to the diffusion of impurities

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Wong, Chi Man. "Phase information enhanced steady-state visual evoked potential-based brain-computer interface". Thesis, University of Macau, 2011. http://umaclib3.umac.mo/record=b2493316.

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Yuan, Xichen. "Charges à l’interface liquide/solide : caractérisation par courants d’écoulement et application à la préconcentration de molécules biologiques dans un système micro/nanofluidique". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1214/document.

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Les charges à l'interface liquide/solide sont un élément originel majeur des phénomènes électrocinétiques observés en micro/nanofluidique. Elles sont donc la colonne vertébrale de mon manuscrit de thèse, qui se décompose en trois parties : Dans la première partie, un rappel des concepts de base sur les interfaces liquides/solides est proposé au lecteur. Il est suivi d'une description des différentes méthodes expérimentales permettant de mesurer le potentiel zeta de couples solide/électrolyte, puis d'une présentation des travaux de la littérature exploitant les charges aux interfaces pour la préconcentration de molécules biologiques dans des systèmes Micro-Nano-Micro (MNM) fluidiques. Ensuite, une deuxième partie est consacrée à la mesure du potentiel zeta par la méthode des courants d'écoulement. Nous y présentons l'amélioration du banc expérimental issu des travaux antérieurs à ma thèse, ainsi que le développement de nouveaux protocoles de préparation des surfaces permettant de rationaliser et de stabiliser les mesures. Une application à un détecteur original de molécules biologiques clos cette deuxième partie. Enfin, la troisième et dernière partie s'intéresse à la préconcentration de molécules biologiques. Une méthode originale de fabrication des dispositifs MNM et les résultats de préconcentration obtenus, très encourageants, sont décrits. Des premiers modèles numériques et phénoménologiques sont proposés, qui mettent en avant l'originalité de notre travail
The charges at liquid/solid interfaces are a key element for both understanding and exploiting the electrokinetic phenomena in micro/nanofluidics. The manuscript of my Ph.D thesis is dedicated to these phenomena, which is divided into three main parts: Above all, a simple overview of charges at the liquid/solid interface is proposed. Then, several common methods for measuring the zeta potential at the liquid/solid interface are described. Next, various effective methods to preconcentrate the biological molecules is presented with the help of the surface charges. Secondly, the streaming current, which is a standard method to measure the zeta potential in our laboratory, is detailed. It contains the upgrade of the experimental setup from the previous version and the development of new protocols, which improve dramatically the stabilization and the reproducibility of the measurements. In addition, an original biological sensor is briefly presented based on these advancements. Lastly, in the final part, we describe a method which is primitively utilised in the fabrication of Micro-Nano-Micro fluidic system. Based on this system, some favorable preconcentration results is obtained. Moreover, numerical simulations are presented to prove the originality of our work

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Wu, Chi-Hsu. "A distance adaptable brain-computer interface based on steady-state visual evoked potential". Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27946.

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Brain-computer interfaces (BCI) provide an alternative communication channel which does not rely on the brain's normal output pathway between patients suffering from neuromuscular diseases and their external environment. BCI requires at least one brain signal as input in order to interpret the intent of the user. Non-invasive electroencephalography (EEG) is the most common and favourite method for acquiring brain signals. In the last two decades, several EEG based BCIs have been developed to help these patients. The brain signals which can be recorded in EEG and used as the input for BCIs include motor sensory rhythm, slow cortical potential, P300 and steady-state visual evoked potential (SSVEP). Compared to the other EEG based BCI paradigms, SSVEP based BCI has the advantage of high information transfer rate, high detection rate, less user training time required and commands scalability. Furthermore, SSVEP based BCI is normally operated in the self paced mode which is more intuitive and practical for real world applications. Recently, SSVEP based BCIs have attracted great attention in the field of BCI research. While most SSVEP BCI studies focus on the improvement of signal detection and classification accuracy, there is a need to bridge the gap between BCI research and practice in the real world. SSVEP based BCI requires an external visual stimulator to elicit SSVEP response. Currently, for most SSVEP based BCIs the viewing distances between the visual stimulator and the users are less than 100cm, limiting the usability and flexibility of BCI and its potential applications and users. This study proposes a novel distance adaptable SSVEP BCI paradigm which allows its users to operate the system from a range of viewing distances between the user and the visual stimulator. Unlike the conventional SSVEP BCI where users can only operate the system when they are sitting in front of the visual stimulator at a fixed distance which is normally less than 100cm, in our proposed system, users can operate the BCI at any viewing distance within the range in this proposed BCI. It is hoped that the proposed BCI system can improve the usability and the flexibility of BCI and also broaden the range of potential applications and users. For example, it can be used by older people with degenerating mobility or by patients with impaired mobility in the care environment to support their independence. Moreover, it can also be used by healthy people in a smart home or for a game control environment. The primary goal of the present study is to investigate the feasibility of the proposed distance adaptable SSVEP based BCI. This study first investigates the impact of the viewing distance on SSVEP response and compensates the deteriorated SSVEP resulting from the viewing distance by changing the intensities of the visual stimuli. 10 healthy subjects participate in the experiment to assess the feasibility of the distance adaptable SSVEP based BCI. The feasibility of the system is evaluated by the classification performance of off-line experiments at different viewing distances. The classification accuracies of the proposed BCI are examined by different EEG time window lengths, number of SSVEP harmonics and the number of recording electrodes employed. This study also investigates the sources of deterioration of SSVEP detection in BCI setup and proposes an electrode ranking method to select the recording electrodes for the implementation of the real time on line system. The experimental results demonstrate that a distance adaptable SSVEP BCI is achievable and that electrodes chosen by the proposed electrode ranking method outperform electrodes chosen by random selection in classification performance.

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CHITNIS, VENKATESH D. "DEVELOPMENT OF A SOLVER FOR POTENTIAL PROBLEMS AND GRAPHICAL USER INTERFACE FOR UCWAVES". University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092095169.

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Sprague, Samantha A. "The Effects of Working Memory on Brain-Computer Interface Performance". Digital Commons @ East Tennessee State University, 2014. https://dc.etsu.edu/etd/2400.

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Amyotrophic lateral sclerosis and other neurodegenerative disorders can cause individuals to lose control of their muscles until they are unable to move or communicate. The development of brain-computer interface (BCI) technology has provided these individuals with an alternative method of communication that does not require muscle movement. Recent research has shown the impact psychological factors have on BCI performance and has highlighted the need for further research. Working memory is one psychological factor that could influence BCI performance. The purpose of the present study is to evaluate the relationship between working memory and brain-computer interface performance. The results indicate that both working memory and general intelligence are significant predictors of BCI performance. This suggests that working memory training could be used to improve performance on a BCI task.

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Bhardwaj, Suresh. "Challenges and potential of technology integration in modern ship management practices". Thesis, University of Plymouth, 2013. http://hdl.handle.net/10026.1/2840.

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This thesis explores the challenges and potential of technology integration in current ship management practices. While technology advancements were designed to be contributing to minimising task complexity, issues such as fatigue, increased administrative burden and technology assisted accidents still plague the industry. In spite of the clearly recognisable benefits of using modern technology in the management of ships, in practice its application appears lacking by a considerable margin. The main driver of the study was to appreciate the cause of this disparity. The study first reviewed a wide body of literature on issues involving the use of technology which included academic literature with empirical evidences and theoretical explanations of implementation of technology at work. With the help of the extant knowledge this research embarked on providing an explanation to the gap that existed in the application of technology in the shipping industry. By taking a case study approach the thesis looked into the induction and integration of technology in the management and operation of ships that primarily interfaced closely between the ship and its management unit on shore. Three companies with mutually diverse management setup were studied. The fourth case comprised of purposefully selected senior members of ships’ staff. The analysis of the data revealed that the manifestation of the gap in technology implementation is caused by deeper influences at work in the shipping industry. The un-optimised technology integration results in the seafarer, who is the keystone to the technology application, becoming a victim of the circumstances. The technology that was intended to ease operations and burdens ends up in controlling him, even leaving him under-resourced and causing fatigue.This was not an unintended outcome but the result of weak regulatory practices, short-term capital outlook and weakened labour practices in the shipping industry all caused by wider social and economic developments affecting not just this industry but businesses globally. The impact of such influences was however more acute in this industry resulting in such extreme consequence. By bringing to light the limited application of some fundamental principles of human-systems integration, this study has attempted to expand the boundaries of research on the subject and contributed to the holistic understanding of the various underlying factors that influence technology integration in ship management processes.

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Franzen, Melissa. "Dinâmica do fósforo na interface água-sedimento em reservatórios". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/32460.

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Os sedimentos aquáticos podem fornecer importantes subsídios na avaliação dos ecossistemas aquáticos lênticos, uma vez que grande parte dos nutrientes se encontra no estado sólido. A ocorrência de uma floração de cianobactérias tóxicas originada no Blang, segundo de três reservatórios em cascata do Sistema Salto de Hidrelétricas, localizado no município de São Francisco de Paula (RS), motivou a investigação das possíveis fontes de nutrientes, especialmente de fósforo (P) que foi identificado como limitante para a eutrofização. Foram investigadas fontes de origens difusas (solos, águas e sedimentos dos tributários) e pontuais (uso urbano e a carga interna representada pelo sedimento do leito dos reservatórios). Os resultados mostraram características oligotróficas nas fontes externas e a presença de P disponível em excesso no sedimento do leito, indicando que a carga interna poderia ser uma fonte significativa de nutrientes. A possibilidade de circulação da água hipolimnética foi investigada através de números adimensionais e características físicas do corpo de água, demonstrando que dificilmente ocorreria, uma vez que somente eventos climáticos extremos poderiam provocar a inversão da massa líquida. Excluídas as fontes externas, os resultados sugerem que a fertilização do reservatório Blang tenha sido causada pela abertura da comporta de fundo do reservatório Divisa, localizado imediatamente à montante, durante uma estiagem. O segundo objetivo desta pesquisa foi avaliar a importância dos agregados de partículas e da seleção granulométrica para a análise química de nutrientes em sedimentos aquáticos. Resultados obtidos em sedimentos de ambientes lóticos e lênticos (Sistema Salto, RS), demonstraram que os agregados maiores (465 - 63 μm) concentram nitrogênio nos ambientes lênticos, por isso a análise deve ser realizada, preferencialmente, na fração ≤ 465 μm em sedimentos de ambientes lênticos e na fração ≤ 63 μm dos ambientes lóticos. O último objetivo deste estudo foi testar os efeitos da oxidação sobre a capacidade e a velocidade da sorção de fosfato em sedimentos aquáticos orgânicos, identificando as melhores condições para retenção. Foram utilizados sedimentos aquáticos siliciclásticos de origens distintas, principalmente no que se refere ao clima e à origem do conteúdo orgânico, alóctone e autóctone, representados pelos tipos Dy (Reservatório Divisa, RS) e Sapropel (Reservatório de Tapacurá, São Lourenço da Mata, PE) respectivamente. O experimento foi realizado em suspensões de sedimentos mantidos sob níveis de potencial redox compreendidos entre - 200 mV e + 400 mV. Resultados demonstram que a sorção de fosfato é maior no sedimento tipo Dy em condições reduzidas e no Sapropel em condições oxidadas.
Water-borne sediments can provide important information for evaluating lentic aquatic ecosystems because a large proportion of their nutrients are found in the solid phase. A toxic algal bloom in the Blang Reservoir, the second of three in the Salto System chain of hydroelectric dams located in Sao Francisco de Paula in Rio Grande do Sul, Brazil, motivated the investigation of possible nutrient sources, especially phosphorus, which was identified as the limiting nutrient for eutrophization. Non-point sources, including soil, water and sediment carried by tributaries, and point sources, including urban areas and the internal load from the reservoir bottom, were examined. Results showed oligotrophic characteristics in the external sources and excess P availability in bottom sediments, indicating that the internal load may be a significant source of nutrients. The possible circulation of hypolimnic water was investigated using adimensional numbers and physical characteristics of the body of water, demonstrating that this is unlikely to occur, since only extreme climatic events could cause inversion of the liquid mass. By excluding external sources, results suggest that the fertilization of the Blang Reservoir was most likely caused by the opening of the floodgates from the Divisa Reservoir immediately upstream during a drought period. The second goal of this study was to evaluate the importance of particle aggregates and particle size selection for chemical analyses of nutrients and water-borne sediments. Results from sediments in lentic and lotic environments from the Salto System show that the larger aggregates (465 - 63 μm) concentrate nitrogen under lentic conditions and that, therefore, analyses should be performed on the fraction smaller than 465 μm in lentic environments and in the fraction ≤ 63 μm in lotic environments. The final objective of this study was to test the effects of oxidation on the phosphate sorption capacity and rate in organic aquatic sediments, identifying the best conditions for retention. Silicate aquatic sediments from different origins in terms of climate and source of organic content (allochtonous or autochtonous) were used, and were represented by the types Dy (Divisa Reservoir, RS) and Sapropel (Tapacurá Reservoir, São Lourenço da Mata, PE), respectively. The experiment was carried out in suspended sediment maintained under levels of redox potential between –200mV and +400mV. Results demonstrated that phosphate sorption is greatest in sediment type Dy under reduced conditions and in Sapropel under oxidized conditions.

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Più fonti

Libri sul tema "Interface potential"

Russell, M. J. The inorganic-organic interface: Geological, chemical and biological potential. Glasgow: University of Glasgow, Dept. of Geology & Applied Geology, 1991.

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Uprichard, Lorraine. A database interface for event-related potential files used in neurophysiology. [s.l: The Author], 1995.

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Hade, John P. Enzymatic disruption of the wheat endosperm-bran interface and its potential impact on the milling performance of wheat. Dublin: University College Dublin, 1996.

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Hill, Linda Ladd. Access to geographic concepts in online bibliographic files: Effectiveness of current practices and the potential of a graphic interface. Ann Arbor, Mich: University Microfilms International, 1991.

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New Zealand. Energy Efficiency and Conservation Authority. Stock-take of electric vehicle interface with electricity and smart grids across APEC economies and the potential for harmonisation. Singapore: APEC Energy Working Group, Asia-Pacific Economic Cooperation, 2012.

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Durden, Douglas W. Regional characterization and assessment of the potential for saltwater intrusion in northeast Florida and Camden County, Georgia, using the sharp-interface approach. Palatka, Fla: St. Johns River Water Management District, 2002.

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Fearn, Michael. Bond order potentials and simulations of clusters and interfaces. Norwich: University of East Anglia, 1993.

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Larkin, Helen J. Studies towards a brain-computer interface for disabled people based on digital processing of evoked & event-related potentials. Dublin: University College Dublin, 1997.

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IAEA. Potential Interface Issues in Spent Fuel Management. International Atomic Energy Agency, 2015.

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Onea, Edgar. Potential Questions at the Semantics-Pragmatics Interface. BRILL, 2016.

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Capitoli di libri sul tema "Interface potential"

Yoshitake, Michiko. "Utilization of Interface Potential". In NIMS Monographs, 127–36. Tokyo: Springer Japan, 2020. http://dx.doi.org/10.1007/978-4-431-56898-8_7.

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Ohshima, Hiroyuki. "Zeta Potential". In Encyclopedia of Colloid and Interface Science, 1423–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-20665-8_162.

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Das, Bhabani Shankar, Ashirbad Sarangi e Debapriya Bhattacharya. "Potential of Curcumin Nanoparticles in Tuberculosis Management". In Bio-Nano Interface, 225–49. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2516-9_13.

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Jit, Bimal Prasad, Biswajita Padhan e Ashok Sharma. "Nanotechnology and Its Potential Implications in Ovary Cancer". In Bio-Nano Interface, 161–75. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2516-9_10.

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Jena, Barsarani, Rina Ningthoujam, Sabita Pattanayak, Santwona Dash, Manasa Kumar Panda, Bimal Prasad Jit, Mohinikanti Das e Yengkhom Disco Singh. "Nanotechnology and Its Potential Application in Postharvest Technology". In Bio-Nano Interface, 93–107. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2516-9_6.

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T., Devasena. "Potential Therapeutic Approaches for SARS CoV2 Infection". In Nanotechnology-COVID-19 Interface, 71–114. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6300-7_6.

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Pradhan, Biswajita, Bimal Prasad Jit, Sairendri Maharana, Shankar Ramchandani e Mrutyunjay Jena. "Bio-nano Interface and Its Potential Application in Alzheimer’s Disease". In Bio-Nano Interface, 209–24. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2516-9_12.

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Wakamori, Minoru. "Transient receptor potential channels and mechanobiology". In Interface Oral Health Science 2009, 48–52. Tokyo: Springer Japan, 2010. http://dx.doi.org/10.1007/978-4-431-99644-6_7.

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Kumar, Narendra, Sarika Chaturvedi e S. M. Paul Khurana. "Potential of Plant-Microbe Interactions in Management of Pesticide-Riddled Soil". In Plant Microbe Interface, 195–218. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-19831-2_8.

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Zhang, S. B., Marvin L. Cohen e Steven G. Louie. "Interface potential changes and Schottky barriers". In Perspectives in Condensed Matter Physics, 188–90. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0657-0_25.

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Atti di convegni sul tema "Interface potential"

Ni, Xueqi, Mingjie Zhang, Beicheng Lou, Shanhui Fan, Eric Mazur, Yuan Cao e Haoning Tang. "Topological Nonlinear Optics in Twisted h-BN Interface". In CLEO: Fundamental Science, FF2N.1. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_fs.2024.ff2n.1.

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Our research demonstrates tunable second harmonic generation in quantum material heterostructures, revealing nontrivial topological properties in their nonlinear optical responses with potential applications in quantum optics and condensed matter physics.

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Boutani, H., e M. Ohsuga. "Input interface using event-related potential P3". In 2012 34th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2012. http://dx.doi.org/10.1109/embc.2012.6347484.

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Peterson, Andrew. "Constant-potential reactions at the electrochemical interface". In International Conference on Electrocatalysis for Energy Applications and Sustainable Chemicals. València: Fundació Scito, 2020. http://dx.doi.org/10.29363/nanoge.ecocat.2020.029.

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Anah, J., B. Rigaud e J. P. Morucci. "Multi-function interface unit for applied potential tomography". In Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 1988. http://dx.doi.org/10.1109/iembs.1988.94520.

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Ishak, Zurida, Onki Alexander, Omar Ismael Al-Sanjary e Eddy Yusuf. "Potential Students Preferences Towards University Website Interface Design:The Methodology". In 2020 16th IEEE International Colloquium on Signal Processing & Its Applications (CSPA). IEEE, 2020. http://dx.doi.org/10.1109/cspa48992.2020.9068724.

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Speight, Evan, Hazim Abdel-Shafi e John K. Bennett. "Realizing the performance potential of the virtual interface architecture". In the 13th international conference. New York, New York, USA: ACM Press, 1999. http://dx.doi.org/10.1145/305138.305192.

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Li, Zheng, e Huasong Min. "Error Related Potential Detection Algorithm for Brain Computer Interface". In 2024 36th Chinese Control and Decision Conference (CCDC). IEEE, 2024. http://dx.doi.org/10.1109/ccdc62350.2024.10587857.

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Chen, Shih-Chung, Shih-Chang Hsieh e Chih-Kuo Liang. "An Intelligent Brain Computer Interface of Visual Evoked Potential EEG". In 2008 Eighth International Conference on Intelligent Systems Design and Applications (ISDA). IEEE, 2008. http://dx.doi.org/10.1109/isda.2008.339.

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Meraz, Noel Segura, Yasuhisa Hasegawa e Junji Takahashi. "Generic bioelectrical potential signal human-computer interface with electrostimulation feedback". In 2012 IEEE International Conference on Robotics and Biomimetics (ROBIO). IEEE, 2012. http://dx.doi.org/10.1109/robio.2012.6491177.

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Calverley, Mark J., e Richard C. Fleet. "Metocean Data: Maximising Potential Cost Benefit". In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57379.

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Metocean data are critical through the oil and gas development life cycle. However, the approach taken to acquisition of metocean data (whether modelled or measured), and its subsequent storage and distribution, is often not properly addressed to consider requirements beyond individual components of the life cycle. Additionally a disconnected approach to data-driven projects lacks the benefits afforded through an integrated system that can lead to both operational and financial inefficiencies. The proper consideration of metocean data is briefly discussed in this paper. However the focus of the paper is the description of a web based system that provides access to metocean data in a range of formats that best meet the needs of non-expert end users. The system can deliver: • hindcast data, • forecast data, • near real time in-situ measurement data, • and earth observing data. All readily queried through a simple a ‘GIS’ style interface. The system can be considered as a number of elements: • Data import and retrieval; • Data storage; • Data interface; • Client management system; • Client interface. The data platform underpinning the architecture is designed to readily interface to all types of data delivery, both into and out of the system. The Client Management System ensures that access to data is restricted to bona fide users of the companies owning the data. The system aims to utilise the best available technology and where appropriate to utilise available ‘off the shelf’ solutions. The focus of the work for these elements has been determining data structures and the interface between the elements. The client interface was considered to be the highly critical element as it is the only element seen by the client. It has been developed with a range of end users in mind. The information delivered will be tailored by the system to meet the requirements of various end user applications. For example meteorological and wave data may be delivered to meet the requirements of legislation to support helicopter operations. The same data may be delivered in a different way to support construction activity such that a traffic light system is applied to operational limits. The system permits delivery via standard internet browsers on a PC or via PDAs, thus enabling decision makers onshore to be aware of in-field conditions. Alerts on conditions can also be applied to ensure that personnel are aware of potential impact of metocean conditions on offshore operations.

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Rapporti di organizzazioni sul tema "Interface potential"

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

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fthenakis, Vasilis. GIS-Based Graphical User Interface Tools for Analyzing Solar Thermal Desalination Systems & High-Potential Implementation. Office of Scientific and Technical Information (OSTI), marzo 2022. http://dx.doi.org/10.2172/1859725.

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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), ottobre 1992. http://dx.doi.org/10.2172/7204420.

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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), ottobre 1992. http://dx.doi.org/10.2172/10182768.

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Shani, Uri, Lynn Dudley, Alon Ben-Gal, Menachem Moshelion e Yajun Wu. Root Conductance, Root-soil Interface Water Potential, Water and Ion Channel Function, and Tissue Expression Profile as Affected by Environmental Conditions. United States Department of Agriculture, ottobre 2007. http://dx.doi.org/10.32747/2007.7592119.bard.

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Constraints on water resources and the environment necessitate more efficient use of water. The key to efficient management is an understanding of the physical and physiological processes occurring in the soil-root hydraulic continuum.While both soil and plant leaf water potentials are well understood, modeled and measured, the root-soil interface where actual uptake processes occur has not been sufficiently studied. The water potential at the root-soil interface (yᵣₒₒₜ), determined by environmental conditions and by soil and plant hydraulic properties, serves as a boundary value in soil and plant uptake equations. In this work, we propose to 1) refine and implement a method for measuring yᵣₒₒₜ; 2) measure yᵣₒₒₜ, water uptake and root hydraulic conductivity for wild type tomato and Arabidopsis under varied q, K⁺, Na⁺ and Cl⁻ levels in the root zone; 3) verify the role of MIPs and ion channels response to q, K⁺ and Na⁺ levels in Arabidopsis and tomato; 4) study the relationships between yᵣₒₒₜ and root hydraulic conductivity for various crops representing important botanical and agricultural species, under conditions of varying soil types, water contents and salinity; and 5) integrate the above to water uptake term(s) to be implemented in models. We have made significant progress toward establishing the efficacy of the emittensiometer and on the molecular biology studies. We have added an additional method for measuring ψᵣₒₒₜ. High-frequency water application through the water source while the plant emerges and becomes established encourages roots to develop towards and into the water source itself. The yᵣₒₒₜ and yₛₒᵢₗ values reflected wetting and drying processes in the rhizosphere and in the bulk soil. Thus, yᵣₒₒₜ can be manipulated by changing irrigation level and frequency. An important and surprising finding resulting from the current research is the obtained yᵣₒₒₜ value. The yᵣₒₒₜ measured using the three different methods: emittensiometer, micro-tensiometer and MRI imaging in both sunflower, tomato and corn plants fell in the same range and were higher by one to three orders of magnitude from the values of -600 to -15,000 cm suggested in the literature. We have added additional information on the regulation of aquaporins and transporters at the transcript and protein levels, particularly under stress. Our preliminary results show that overexpression of one aquaporin gene in tomato dramatically increases its transpiration level (unpublished results). Based on this information, we started screening mutants for other aquaporin genes. During the feasibility testing year, we identified homozygous mutants for eight aquaporin genes, including six mutants for five of the PIP2 genes. Including the homozygous mutants directly available at the ABRC seed stock center, we now have mutants for 11 of the 19 aquaporin genes of interest. Currently, we are screening mutants for other aquaporin genes and ion transporter genes. Understanding plant water uptake under stress is essential for the further advancement of molecular plant stress tolerance work as well as for efficient use of water in agriculture. Virtually all of Israel’s agriculture and about 40% of US agriculture is made possible by irrigation. Both countries face increasing risk of water shortages as urban requirements grow. Both countries will have to find methods of protecting the soil resource while conserving water resources—goals that appear to be in direct conflict. The climate-plant-soil-water system is nonlinear with many feedback mechanisms. Conceptual plant uptake and growth models and mechanism-based computer-simulation models will be valuable tools in developing irrigation regimes and methods that maximize the efficiency of agricultural water. This proposal will contribute to the development of these models by providing critical information on water extraction by the plant that will result in improved predictions of both water requirements and crop yields. Plant water use and plant response to environmental conditions cannot possibly be understood by using the tools and language of a single scientific discipline. This proposal links the disciplines of soil physics and soil physical chemistry with plant physiology and molecular biology in order to correctly treat and understand the soil-plant interface in terms of integrated comprehension. Results from the project will contribute to a mechanistic understanding of the SPAC and will inspire continued multidisciplinary research.

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Shapovalov, Yevhenii B., Zhanna I. Bilyk, Artem I. Atamas, Viktor B. Shapovalov e Aleksandr D. Uchitel. The Potential of Using Google Expeditions and Google Lens Tools under STEM-education in Ukraine. [б. в.], novembre 2018. http://dx.doi.org/10.31812/123456789/2665.

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The expediency of using the augmented reality in the case of using of STEM-education in Ukraine is shown. The features of the augmented reality and its classification are described. The possibilities of using the Google Expeditions and Google Lens as platforms of the augmented reality is analyzed. A comparison, analysis, synthesis, induction and deduction was carried out to study the potential of using augmented reality platforms in the educational process. Main characteristics of Google Expeditions and Google Lens are described. There determined that augmented reality tools can improve students motivation to learn and correspond to trends of STEM-education. However, there problems of using of augmented reality platforms, such as the lack of awareness of this system by teachers, the lack of guidance, the absence of the Ukrainian-language interface and responding of educational programs of the Ministry of Education and Science of Ukraine. There proposed to involve methodical and pedagogical specialists to development of methodical provision of the tools of augmented reality.

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Hrebeniuk, Bohdan V., e Olena H. Rybalchenko. Development of an automated system for conducting, checking and evaluating programming competitions. CEUR Workshop Proceedings, marzo 2021. http://dx.doi.org/10.31812/123456789/4429.

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The paper analyzes the existing platforms for conducting programming contests. Possible approaches are analyzed for creating isolated environments and running participants’ solutions, advantages and disadvantages of both approaches are highlighted. Requirements for the user interface are defined that must provide quick and convenient work in the system; the system was planned and developed. It was concluded that designed system has a potential for conducting contests and further development.

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Walthert, Lorenz, Douglas R. Cobos e Patrick Schleppi. Technical report. Equations for improving the accuracy of Decagon MPS-2 matric potential readings in dry soils. Swiss Federal Institute for Forest, Snow and Landscape Research, WSL, novembre 2023. http://dx.doi.org/10.55419/wsl:33724.

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Soil matric potential quantifies water availability in soils. Low soil matric potentials are difficult to measure with most in situ techniques. This is also the case for the widely-used dielectric MPS-2 sensor. This probe determines matric potential indirectly from the measured water content in its porous sensor ceramics using dielectric permittivity as a proxy for water content. The accuracy of MPS-2 readings was analyzed in desiccation experiments using 13 soils with different texture and organic carbon content and a WP4C dewpoint potentiometer as reference instrument. Further, it was explored whether observed inaccuracies relate to sensor calibration, confounding dielectric effects, or the water release characteristics of the sensor ceramics. Above -1000 kPa, the MPS-2 readings were accurate in all tested soils with a mean deviation of 3% to the reference values. Below -1000 kPa, MPS-2 readings were increasingly higher than the reference in all tested soils, but the deviation from the reference depended on soil type. Poor factory calibration of the sensors, soil texture dependent differences of water flow at the soil-ceramic interface, and dielectric effects are supposed to be the main reasons for the low and soil-type-specific MPS-2 sensor accuracy in dry soils. Nevertheless, the high consistency of the MPS-2 readings allowed us to derive soil-type-specific equations to improve the accuracy of measurements to values as low as -4000 kPa. We recommend applying the equations to any MPS-2 readings below ~ -1000 kPa to obtain more reliable data and thus an improved insight into the role of soil water in ecosystems.

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Matus, Sean, e Daniel Gambill. Automation of gridded HEC-HMS model development using Python : initial condition testing and calibration applications. Engineer Research and Development Center (U.S.), novembre 2022. http://dx.doi.org/10.21079/11681/46126.

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The US Army Corps of Engineers’s (USACE) Hydrologic Engineering Center-Hydrologic Modeling System (HEC-HMS) rainfall-runoff model is widely used within the research community to develop both event-based and continuous rainfall-runoff models. The soil moisture accounting (SMA) algorithm is commonly used for long-term simulations. Depending on the final model setup, 12 to 18 parameters are needed to characterize the modeled watershed’s canopy, surface, soil, and routing processes, all of which are potential calibration parameters. HEC-HMS includes optimization tools to facilitate model calibration, but only initial conditions (ICs) can be calibrated when using the gridded SMA algorithm. Calibrating a continuous SMA HEC-HMS model is an iterative process that can require hundreds of simulations, a time intensive process requiring automation. HEC-HMS is written in Java and is predominantly run through a graphical user interface (GUI). As such, conducting a long-term gridded SMA calibration is infeasible using the GUI. USACE Construction Engineering Research Laboratory (CERL) has written a workflow that utilizes the existing Jython application programming interface (API) to batch run HEC-HMS simulations with Python. The workflow allows for gridded SMA HEC-HMS model sensitivity and calibration analyses to be conducted in a timely manner.

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Vera, Jose, e Ken Evans. PR186-203600-Z01 Impact of Drag Reducing Agents on Corrosion Management. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), ottobre 2021. http://dx.doi.org/10.55274/r0012177.

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The purpose of this research was to understand the potential impact of drag reducing agents (DRA) on internal corrosion of liquid hydrocarbon pipelines. The first task of this project included a comprehensive review of literature and knowledge, both in public domain and from industry experience, on the effect of DRA on water and solid transport in liquid hydrocarbons, and possible interactions with other performance chemicals typically used in the oil and gas industry. This was the basis for defining the final bench test methodology and test matrix to be performed in the second task. A novel bench-top apparatus was designed based on a vertical Couette cell approach, and a test methodology was successfully implemented to evaluate the potential effect(s) of DRA on water accumulation and localized corrosion at the oil/water interface. A test matrix was conducted with two DRAs (a water based and an oil based) and two corrosion inhibitors (a water soluble and an oil soluble) at a given test condition (3.5% NaCl saturated with 97%CO2/3%O2, pH ~6 at 80 oF). There is a related webinar.

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