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Статті в журналах з теми "Non-local correlation"
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Ben-Naim, Arieh. "Local and non-local correlation in liquids and liquid mixtures." Chemical Physics 331, no. 2-3 (January 2007): 283–88. http://dx.doi.org/10.1016/j.chemphys.2006.10.019.
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Montina, Alberto, and Stefan Wolf. "Discrimination of Non-Local Correlations." Entropy 21, no. 2 (January 23, 2019): 104. http://dx.doi.org/10.3390/e21020104.
Повний текст джерелаАнотація:
In view of the importance of quantum non-locality in cryptography, quantum computation, and communication complexity, it is crucial to decide whether a given correlation exhibits non-locality or not. As proved by Pitowski, this problem is NP-complete, and is thus computationally intractable unless NP is equal to P. In this paper, we first prove that the Euclidean distance of given correlations from the local polytope can be computed in polynomial time with arbitrary fixed error, granted the access to a certain oracle; namely, given a fixed error, we derive two upper bounds on the running time. The first bound is linear in the number of measurements. The second bound scales with the number of measurements to the sixth power. The former holds only for a very high number of measurements, and is never observed in the performed numerical tests. We, then, introduce a simple algorithm for simulating the oracle. In all of the considered numerical tests, the simulation of the oracle contributes with a multiplicative factor to the overall running time and, thus, does not affect the sixth-power law of the oracle-assisted algorithm.
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Dou, Ling-Yu, Lu Gao, and Xin-Bing Song. "Non-local correlation interference with pseudo-thermal light." Optics Communications 381 (December 2016): 323–26. http://dx.doi.org/10.1016/j.optcom.2016.07.004.
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Rubaszek, Anna. "Non-local electron-positron correlation effects for SiC." physica status solidi (c) 6, no. 11 (November 2009): 2530–32. http://dx.doi.org/10.1002/pssc.200882065.
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Lan, Cuiling, Jizheng Xu, Guangming Shi, and Feng Wu. "Exploiting Non-Local Correlation via Signal-Dependent Transform (SDT)." IEEE Journal of Selected Topics in Signal Processing 5, no. 7 (November 2011): 1298–308. http://dx.doi.org/10.1109/jstsp.2011.2165273.
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Zhai, Lu-Sheng, and Ruo-Yu Liu. "Local detrended cross-correlation analysis for non-stationary time series." Physica A: Statistical Mechanics and its Applications 513 (January 2019): 222–33. http://dx.doi.org/10.1016/j.physa.2018.09.006.
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Mohamed, A. B. A. "Non-local correlation and quantum discord in two atoms in the non-degenerate model." Annals of Physics 327, no. 12 (December 2012): 3130–37. http://dx.doi.org/10.1016/j.aop.2012.08.003.
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Gritsenko, O. V., A. Rubio, L. C. Balbás, and J. A. Alonso. "Non-local exchange and local Coulomb correlation energy density functionals for finite many-electron systems." Chemical Physics Letters 205, no. 4-5 (April 1993): 348–53. http://dx.doi.org/10.1016/0009-2614(93)87133-n.
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Hautman, J., and L. M. Sander. "Non-local exchange correlation energy in quasi-two-dimensional electron layers." Superlattices and Microstructures 1, no. 1 (January 1985): 39–42. http://dx.doi.org/10.1016/0749-6036(85)90026-6.
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Ossicini, Stefano, C. M. Bertoni, and P. Gies. "Non-local exchange and correlation in the jellium model of surfaces." Surface Science Letters 178, no. 1-3 (December 1986): A646—A647. http://dx.doi.org/10.1016/0167-2584(86)90147-7.
Повний текст джерелаДисертації з теми "Non-local correlation"
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Rushton, Philip Peter. "Towards a non-local density functional description of exchange and correlation." Thesis, Durham University, 2002. http://etheses.dur.ac.uk/3746/.
Повний текст джерелаАнотація:
Kohn-Sham density functional theory (DFT) is a popular method used to investigate the properties of matter. Although exact in principle, DFT is in practice limited by a single approximation for the exchange-correlation functional - the quantity that describes the many-body interactions between electrons. This thesis is concerned with developing improved exchange-correlation functionals for use in practical DFT calculations. The standard functional currently used in solid state physics, and also popular in quantum chemistry, is the generalised gradient approximation (GGA), which requires only the local density, n(r), and the density gradient, ∆n(r), as input. A flexible semi-empirical GGA form, containing 15 free parameters that are fitted to near-exact molecular data is implemented within the plane-wave pseudopotential (PW-PP) Kohn-Sham scheme, to assess the possibility of employing semi-empirical GGAs in solid state applications. Self-consistent calculations performed for several bulk semiconductor properties using this GGA reveal that, overall, no improvement is attained over a conventional non-empirical GGA used in solid state physics. The remainder of the thesis focuses on a fully non-local functional known as the weighted density approximation (WDA), which utilises the global density of a system, n(r'), as input. An efficient computational algorithm is devised for use within the PW-PP formalism which enables fully self-consistent WDA calculations to be performed. Physical properties are shown to be intimately related to the particular form used for the pair-correlation function, Gwda/xc(r,r'), and by comparing with recent variational Monte Carlo (VMC) data, it is shown that the forms that provide a good description of exchange-correlation holes, nxc(r,r'), also lead to the most accurate bulk properties. For strongly inhomogeneous electron gas systems, the WDA provides close agreement with the VMC method for a variety of exchange-correlation quantities. The success of the fully non-local approach given by the WDA for other model electron gas systems studied suggests that the WDA is a very promising functional.
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Pfeffer, Andreas Helmut. "Electronic properties of diffusive three-terminal Josephson junctions : a search for non-local quartets." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENY068.
Повний текст джерелаАнотація:
Pendant ce travail de thèse, j'ai tout d'abord finalisé le développement d'un système expérimental unique dédié aux études de transport électronique de nanostructures multi-terminaux de faible impédance. Ce dispositif permet des mesures de conductance et de bruit à très basse température (30 mK), avec une résolution du pico-ampère en utilisant des SQUIDs comme amplificateurs de courant. Dans le chapitre 5, je fournis une description du fonctionnement de la mesure. De plus, je décris la calibration du dispositif et la manière de déduire des quantités physiques à partir des mesures.Au Chapitre 6, je décris des mesures de transport avec des jonctions diffusives à trois terminaux (trijonctions). Dans une géométrie, que l'on appelle T-shape, des électrodes supraconductrices d'Aluminium sont connectées entre-elles par une partie centrale métallique non-supraconductrice de Cuivre. Pour ces nanostructures, on observe des anomalies de conductance à basse tension qui n'ont jamais été observées expérimentalement. Ces anomalies de résistance/conductance ressemblant fortement à l'effet Josephson apparaissant lorsque deux des potentiels appliqués à la trijonction ont une somme nulle. Les anomalies sont présentes sur une large échelle de tension sans perte d'amplitude. De-même, elles montrent une grande robustesse en température. Des expériences sous champ magnétique appliqué montrent une forte suppression des anomalies pour un champ magnétique correspondant à flux magnétique dans la partie normale de l'ordre d'un quantum de flux. Ceci indique qu'un mécanisme cohérent de phase doit être à l'origine des anomalies. Dans la littérature, deux mécanismes sont proposés pour expliquer ces effets.Le premier, nommé "mode-locking", est un accrochage dynamique des courants Josephson ac, qui est induit par l'environnement expérimental (circuit). Cette situation a été étudiée dans les années soixante sur des microstructures Josephson couplées à base de liens faibles. Pour tester cette explication, nous avons mesuré un échantillon composé de deux jonctions Josephson spatialement séparées. Les anomalies n'apparaissent pas dans une telle géométrie, pas même avec une amplitude réduite. Ceci indique qu'une synchronisation par l'environnement expérimental ne peut pas être à l'origine des anomalies observées. Le deuxième mécanisme théorique évoqué est nommé "mode de quartet" et a été proposé récemment par Freyn et collaborateurs. L'une des électrodes supraconductrices distribue alors des doublets de paires de Cooper. Chacune de ces deux paires se scindent alors en deux quasiparticles se propageant chacune vers deux contacts supraconducteurs différents. Dans un tel mécanisme deux quasiparticules, issues de deux paires de Cooper différentes, arrivent sur chacun des deux contacts supraconducteurs. Lorsque les tensions appliquées entre le contact supraconducteurs émetteur et les deux autres contacts sont exactement opposés, les phases des fonctions d'ondes électroniques des quasiparticules arrivant sur un même contact supraconducteur sont telles que ces deux quasiparticules peuvent se recombiner pour former une paire de Cooper. Par ce mécanisme le doublet de paires de Copper émis se distribue de manière cohérente en deux paires de Cooper chacune dans un contact supraconducteur différent.Ce mécanisme est favorable, car il est robuste envers le désordre et peut ainsi exister sur une large échelle de tensions.Au cours de cette thèse, j'ai montré que ces anomalies sont effectivement présentes pour des tensions appliquées correspondant à des énergies bien supérieures à l'énergie de Thouless. A contrario, les effets cohérents responsables de l'effet Josephson ac doivent être fortement atténués sur cette même échelle d'énergie, ce qui rend peu probable le mécanisme de mode-lockingDuring this PhD, I have first finished the development of a unique experimental set-up, dedicated for studies of electronic transport of low impedance multi-terminal nanostructures. This set-up allows conductance and noise measurements at very low temperature (30 mK), with a resolution of a few pico-ampere by using SQUIDs as current amplifiers. In chapter 5, I give some explanation of the measurement working principle. Furthermore, I explain the calibration of the experimental set-up as well as how to extract physical quantities from the measurements.In chapter6, I explain transport measurements on diffusive tri-terminal junctions (tri-junction). In a T-shape called geometry, the superconducting Al-electrodes are connected via a common metallic, non-superconducting part of Copper. For these nanostructures, we observe features in the conductance at low voltage, which have been never observed yet experimentally. These features in conductance/resistance have a striking resemblance with a dc-Josephson effect, appearing when two applied potentials on the tri-junction compensate exactly each other.In literature, two mechanisms are proposed to explain this effect.The first mechanism, called "mode-locking", corresponds to a dynamic locking of ac-Josephson currents, which is induced by the experimental environment (circuit). This situation has been extensively studied in the 60's on coupled microstructures, based on weak links. In order to test this explanation, we have measured a junction, which is composed of two spatially separated Josephson junctions. The anomalies does not show up in such a geometry, even not with strongly reduced amplitude. This indicates, that synchronization via the experimental environment can't be the origin of the observed features. The second theoretical mechanism is named "quartet-mode" and has been recently proposed by Freyn and Co-workers. In this process, one superconducting electrode emits doublets of Cooper-pairs. Each of the two pairs splits into two quasi particles propagating toward different superconducting contacts. In such a mechanism, two quasi-particles originating of two different Cooper-pairs, arrive each in the two superconducting contacts. If the applied voltage between the emitting superconducting contact and the two other contacts is exactly opposite, the phase of the electronic wave functions of the arriving quasi-particles on the same superconducting contact are such, that these two quasi-particles can recombine by forming a Cooper-pair. Due to this mechanism, the emitted doublet of Cooper-pairs is coherently distributed as two Cooper-pairs, each of them in a different superconducting contact. This mechanism is favored, since it is robust with respect to disorder and can hence also exist over a large range of voltage. During this PhD, I have shown that these anomalies are indeed present for applied voltage corresponding to energies well above the Thouless energy. Argumentum a contrario, the coherent effects responsible for the ac Josephson-effect have to be strongly attenuated over the same range of energy, which makes low probable the effect of mode-locking
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Bettonte, Francesco. "Développement d'une stratégie d'identification des paramètres par recalage de modèle éléments finis à partir de mesures par corrélation d'images : vers l'application à un modèle d'endommagement non local." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEM022/document.
Повний текст джерелаАнотація:
Cette thèse a pour objectif le développement d'une stratégie d'identification des paramètres de plasticité et d'endommagement jusqu'à amorçage, pour des métaux ductiles.Un formalisme logarithmique est utilisé pour simuler les grandes déformations subies par les éprouvettes et une formulation non-locale multi-champ permet de simuler l'adoucissement indépendamment du maillage utilisé et d'éviter le verrouillage volumique.La Corrélation d'Images Digitales est utilisée pour obtenir des mesures hétérogènes plein champ à partir d'éprouvettes entaillées.La stratégie proposée s'appuie sur des observations microscopiques et sur une approche d'identification par recalage de modèle éléments finis (FEMU), visant à minimiser l'écart entre une mesure et son pendant simulé. L'écart est exprimé en termes de force et déplacement grâce à une normalisation appropriée. L'application de la FEMU est guidée par des analyses de sensibilité.La robustesse de la comparaison essai-calcul est assurée par l'application de conditions au bord mesurées. L'effet négatif de l’incertitude de mesure est mis en évidence et une solution de filtrage innovante est proposée.La stratégie est appliquée pour l'identification des paramètres de l'alliage Inconel625. Elle permet de reproduire l'amorçage pour des éprouvettes planes, en termes de réponse macroscopique et de localisation des sites d'amorçageThis thesis proposes an identification strategy for plastic behaviour and damage up to the onset of fracture, for an application to ductile metals.A logarithmic finite strain formulation is used to simulate the large deformations undergone by the specimens, while a locking-free non-local formulation allows a mesh independent simulation of the softening behaviour.Digital Image Correlation is used to obtain heterogeneous full-field measurements from tensile tests on notched specimens.The identification strategy is based both on microscopic observations and on a Finite Element Model Updating (FEMU) technique, according to which the parameters are identified by minimizing the discrepancy between experiment and simulation. The discrepancy is quantified both in terms of displacement and force thanks to an appropriate normalization. The application of FEMU is guided using sensitivity analysis.The robustness of the comparison between simulation and measurement is ensured by prescribing measured displacements as boundary conditions for the simulation. The negative effect of the measurement uncertainty is underlined, and an innovative filtering approach is proposed.The proposed strategy is used to identify the materials' parameters of alloy Inconel625. It allows to reproduce the onset of fracture for flat specimens, both in terms of macroscopic response and crack initiation location
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Rabenseifner, Adrian. "Oblivious transfer from non-local correlations." Zurich : ETH, Swiss Federal Institute of Technology Zurich, Department of Computer Science, Group of Quantum Information, 2009. http://e-collection.ethbib.ethz.ch/show?type=dipl&nr=446.
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Prettico, Giuseppe. "Entanglement and non local correlations: quantum resources for information processing." Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/116776.
Повний текст джерелаАнотація:
Quantum Information Theory (QIT) studies how information can be processed and transmitted when encoded on quantum states. Practically, it can be understood as the effort to generalize Classical Information Theory to the quantum world. Interestingly, the fact that very-small scale Physics differs considerably from that of macroscopic objects offers a richer structure to the new theory. Among other phenomena, entanglement is at the heart of many quantum information protocols. It is the most spectacular and counter-intuitive manifestation of quantum mechanics: it signifies the existence of non-local correlations. Although intrinsically non-intuitive, these strange effects have been shown to lead to intriguing applications with no classical analogue. The main scope of this thesis is to establish qualitative and quantitative connections among the different quantum and classical information resources. Among the many weird effects that quantum systems present, the non-additivity concept plays an important role. In the quantum realm, the joint processing of two quantum resources is often better than the sum of the two resources. Activation is the strongest manifestation of non-additivity. It can be understood as the capability of two objects to achieve a given task that is impossible for each of them when considered individually. From a classical point of view, it is unknown whether such a process can hold. Here we focus on the classical secret-key rate. We provide two probability distributions conjectured to have bound information, hence from which it is conjectured that no secret key can be extracted when taken individually, but that lead to a positive secret-key rate when combined. For that, we exploit the close connection between the information-theoretic key agreement and the quantum entanglement scenario. Successively, we move to the multipartite scenario showing a one-to-one correspondence between bound information and bound entanglement. We provide an example of multipartite bound information which shares the same features of its quantum analogue, the Smolin state. Later, we move to prove a deep connection between privacy and non-locality. We do it by showing that all private states violate the Bell-CHSH inequality. Private states are those entangled states from which a perfectly secure cryptographic key can be extracted. An example of those is the maximally entangled state. But still, there are other private states that are not maximally entangled. While a maximally entangled state violates a Bell's inequality, this is not known a priori for the whole set. We give a general proof valid for any dimension and any number of parties. Private states, then, not only represent the unit of quantum privacy, but also allow two distant parties to establish a different quantum resource, namely non-local correlations. Lastly, we tackle the connection between non-locality and genuine randomness. Non-locality and genuine intrinsic randomness have been the subject of active interest since the early days of quantum physics. Initially, this interest was mainly derived from their foundational and fundamental implications but recently it also has acquired a practical aspect. Recent development in device independent scenario have heightened the need to quantify both the randomness and non-locality inherent in quantum systems. While some works try to deepen this relation, we provide a simple method to detect Bell tests that allow the certification of maximal randomness. These arguments exploit the symmetries of Bell inequalities and assume the uniqueness of the quantum probability distribution maximally violating it. We show how these arguments can be applied to intuit the randomness intrinsic in a probability distribution without resorting to numerical calculations.La Teoría de la Información Cuántica (QIT) estudia como la información puede ser procesada y transmitida al codificarse en estados cuánticos. Prácticamente, se puede pensar como la generalización de la Teoría de Información Clásica al mundo cuántico. El hecho que la física a esta escala difiera considerablemente de aquella de los objetos macroscópicos ofrece una mayor riqueza a la estructura de la nueva teoría. Entre otros fenómenos, el entrelazamiento está a la base de muchos protocolos cuánticos. Es la más espectacular y anti-intuitiva manifestación de la mecánica cuántica observada en sistemas cuánticos compuestos: implica la existencia de correlaciones no-locales. No obstante la extrañeza de estos efectos, se han demostrado distintas aplicaciones sin ningún análogo clásico. El objetivo de esta tesis es establecer conexiones cualitativas y cuantitativas entre los diferentes recursos descritos por la teoría cuántica y clásica. Entre los efectos raros que los sistemas cuánticos muestran, la no-aditividad desempeña un papel muy importante. En el mundo cuántico, el uso de dos recursos cuánticos puede ser más ventajoso que la suma de los dos, considerados individualmente. La activación es la mas fuerte manifestación del fenómeno de no-aditividad. Este proceso se puede entender como la capacidad de dos objetos juntos de lograr una tarea que sería imposible por cada uno de ellos singularmente. Desde un punto de vista clásico, es desconocido si existen procesos o cantidades que no respetan la aditividad. Aquí, nos centramos en la tasa de clave secreta. Presentamos aquí dos distribuciones de probabilidad que conjeturamos contener bound information, o sea a partir de la cuales es imposible destilar bits secretos que dan bits secretos cuando utilizadas conjuntamente. Para probar este resultado, utilizamos la conexión existente entre entrelazamiento y el proceso de establecimiento de seguridad. Sucesivamente desplazándonos al caso multipartito, probamos una correspondencia uno a uno entre la bound information y el entrelazamiento no-destilable. Presentamos un ejemplo de bound information multipartita que comparte las mismas propiedades de su análogo cuántico, el estado de Smolin. Luego profundizamos la relación entre privacidad y no-localidad. Probamos que todos los estados que pertenecen al conjunto de estados privados violan una desigualdad de Bell, conocida como CHSH. Los estados privados son aquellos estados entrelazados de los cuales es posible extraer una clave secreta. Un ejemplo de estos estados es el estado máximamente entrelazado, pero hay otros que son privados aunque no máximamente entrelazados. Es conocido que un estado máximamente entrelazado puede violar una desigualdad de Bell, pero lo que se desconoce es si esto pasa para todos los estados privados. Nuestro resultado es general ya que nuestra prueba es válida para cualquier número de partes y cualquier dimensión del espacio local de cada una. Los estados privados, entonces, no solo permiten destilar una clave de forma segura sino que también presentan una propiedad tan fuerte como la no-localidad. Finalmente, investigamos la relación entre los conceptos de no-localidad y de aleatoriedad. Desde los orígenes de la teoría cuántica, los conceptos de no-localidad y de aleatoriedad fueron objeto de gran interés. A principio este interés se debía más a razones relacionadas con los fundamentos de la teoría, pero recientes resultados han empujado la comunidad científica a investigar ulteriormente y sobre todo a cuantificar la no-localidad y la aleatoriedad presente en los estados cuánticos. Aunque algunos autores se hayan movido en esta direccion, muchas preguntas han quedado sin respuestas. Aquí presentamos un simple método que permite detectar aquellas desigualdades de Bell que pueden certificar la presencia de máxima aleatoriedad. Nuestros resultados prueban como simples argumentos pueden dar complejas respuestas sin la necesidad de recorrer a computaciones numéricas.
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Huber, Arthur [Verfasser], and Alexander [Akademischer Betreuer] Lichtenstein. "Combining local and non-local correlations from methods to real materials / Arthur Huber ; Betreuer: Alexander Lichtenstein." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2019. http://d-nb.info/1186891270/34.
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Stige, Kristoffer. "Spin-Polarized Non-Local Transport in Hybrid Structures with Magnetic and Superconducting Correlations." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18396.
Повний текст джерелаАнотація:
In this thesis we theoretically examine spin-polarized non-local transport in two junctions built up by materials with superconducting and magnetic properties. The first consists of a Zeeman-split superconductor placed between two normal metals. We find that such systems can generate a spin-polarized non-local current even when the injected current is unpolarized. The effect is however mostly geometric and take place also when the superconductor is switched with a normal metal. The second system is built up by two ferromagnetic wires coupled by a superconductor via spin-active interfaces. We investigate the circumstances which allow for an inverse spin-valve effect. For certain parameter ranges we find that a crossover between positive and negative magnetoresistance is possible as a function of temperature.
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Boissieux, Xavier. "Two-phase local heat transfer correlations for non-ozone depleting refrigerant-oil mixtures." Thesis, University of Brighton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287130.
Повний текст джерелаАнотація:
This thesis describes the work undertaken over a 3 year period under a Department of the Environment, Transport and the Regions (DETR) Partners in Technology programme in collaboration with four industrial partners. The aim of the work was to investigate the two-phase flow heat transfer and fluid dynamic performance of the non-ozone depleting refrigerants and lubricating oil mixtures in a horizontal tube. A single tube test facility was designed and built to determine local heat transfer coefficients and overall pressure drop for evaporation and condensation. A circulating pump system pressurised through an accumulator charged with nitrogen was selected to enable accurate setting of the evaporation and condensation conditions. The system was validated using R22. Tests were undertaken for R404A, R407C, Isceon 59 with a Polyol-ester lubricating oil. The experimental data consist of two-phase local heat transfer coefficients and overall pressure drops inside a smooth copper tube. Numerous data were obtained for evaporation and condensation, and constituted a large database of two-phase heat transfer coefficients. The experimental results were compared with several existing correlations traditionally used in heat exchanger design, to assess their suitability with the new refrigerants. As a result of these comparisons offering a poor agreement, a model characterising the variation of the local heat transfer coefficient was developed. The evaporation model consists in a modification of the Kattan et al. model (1998a, b & c). The new model predicts the experimental results well, with a standard deviation of 6.1% for refrigerant R407C and Isceon 59. The effects of lubricating oils on two-phase flow heat transfer are also discussed qualitatively. This work provides a design tool when dealing with the non-ozone depleting refrigerants, and recommendations are made on the use of several correlations.
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Juráček, Ivo. "Zabezpečení senzorů - ověření pravosti obrazu." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2020. http://www.nusl.cz/ntk/nusl-432921.
Повний текст джерелаАнотація:
Diploma thesis is about image sensor security. Goal of the thesis was study data integrity gained from the image sensors. Proposed method is about source camera identification from noise characteristics in image sensors. Research was about influence of denoising algorithms applied to digital images, which was acquired from 15 different image sensors. Finally the statistical evaluation had been done from computed results.
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Cao, Xiaodong [Verfasser], and Philipp [Akademischer Betreuer] Hansmann. "Extensions of dynamical mean-field theory to non-local correlations and multi-band systems / Xiaodong Cao ; Betreuer: Philipp Hansmann." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2019. http://d-nb.info/1217253378/34.
Повний текст джерелаКниги з теми "Non-local correlation"
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Jaeger, Gregg. Quantum Physics: Non-Local Correlation, Causality and Objective Indefiniteness in the Quantum World. Springer Berlin / Heidelberg, 2013.
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Jaeger, Gregg. Quantum Objects: Non-Local Correlation, Causality and Objective Indefiniteness in the Quantum World. Springer Berlin / Heidelberg, 2015.
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Jaeger, Gregg. Quantum Objects: Non-Local Correlation, Causality and Objective Indefiniteness in the Quantum World. Springer London, Limited, 2013.
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Horing, Norman J. Morgenstern. Random Phase Approximation Plasma Phenomenology, Semiclassical and Hydrodynamic Models; Electrodynamics. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198791942.003.0010.
Повний текст джерелаАнотація:
Chapter 10 reviews both homogeneous and inhomogeneous quantum plasma dielectric response phenomenology starting with the RPA polarizability ring diagram in terms of thermal Green’s functions, also energy eigenfunctions. The homogeneous dynamic, non-local inverse dielectric screening functions (K) are exhibited for 3D, 2D, and 1D, encompassing the non-local plasmon spectra and static shielding (e.g. Friedel oscillations and Debye-Thomas-Fermi shielding). The role of a quantizing magnetic field in K is reviewed. Analytically simpler models are described: the semiclassical and classical limits and the hydrodynamic model, including surface plasmons. Exchange and correlation energies are discussed. The van der Waals interaction of two neutral polarizable systems (e.g. physisorption) is described by their individual two-particle Green’s functions: It devolves upon the role of the dynamic, non-local plasma image potential due to screening. The inverse dielectric screening function K also plays a central role in energy loss spectroscopy. Chapter 10 introduces electromagnetic dyadic Green’s functions and the inverse dielectric tensor; also the RPA dynamic, non-local conductivity tensor with application to a planar quantum well. Kramers–Krönig relations are discussed. Determination of electromagnetic response of a compound nanostructure system having several nanostructured parts is discussed, with applications to a quantum well in bulk plasma and also to a superlattice, resulting in coupled plasmon spectra and polaritons.
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Belnap, Nuel, Thomas Müller, and Tomasz Placek. Branching Space-Times. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190884314.001.0001.
Повний текст джерелаАнотація:
This book develops a rigorous theory of indeterminism as a local and modal concept. Its crucial insight is that our world contains events or processes with alternative, really possible outcomes. The theory aims at clarifying what this assumption involves, and it does it in two ways. First, it provides a mathematically rigorous framework for local and modal indeterminism. Second, we support that theory by spelling out the philosophically relevant consequences of this formulation and by showing its fruitful applications in metaphysics. To this end, we offer a formal analysis of modal correlations and of causation, which is applicable in indeterministic and non-local contexts as well. We also propose a rigorous theory of objective single-case probabilities, intended to represent degrees of possibility. In a third step, we link our theory to current physics, investigating how local and modal indeterminism relates to issues in the foundations of physics, in particular, quantum non-locality and spatio-temporal relativity. The book also ventures into the philosophy of time, showing how the theory’s resources can be used to explicate the dynamic concept of the past, present, and future based on local indeterminism.
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Furst, Eric M., and Todd M. Squires. Multiple particle tracking. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199655205.003.0004.
Повний текст джерелаАнотація:
The fundamentals and best practices of multiple particle tracking microrheology are discussed, including methods for producing video microscopy data, analyzing data to obtain mean-squared displacements and displacement correlations, and, critically, the accuracy and errors (static and dynamic) associated with particle tracking. Applications presented include two-point microrheology, methods for characterizing heterogeneous material rheology, and shell models of local (non-continuum) heterogeneity. Particle tracking has a long history. The earliest descriptions of Brownian motion relied on precise observations, and later quantitative measurements, using light microscopy.
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Healey, Richard. Causation and Locality. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198714057.003.0010.
Повний текст джерелаАнотація:
By moving to the context of relativistic space-time structure, this chapter completes the argument of Chapter 4 that we can use quantum theory locally to explain correlations that violate Bell inequalities with no instantaneous action at a distance. Chance here must be relativized not just to time but to a space-time point, so that an event may have more than one chance at the same time—it may even be certain relative to one space-time point but ‘at the same time’ completely uncertain relative to another. This renders Bell’s principle of Local Causality either inapplicable or intuitively unmotivated. Counterfactual dependence between the outcomes of measurements on systems assigned an entangled state is not causal since neither outcome is subject to intervention: but it may still be appealed to in a non-causal explanation of one in terms of the other.
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Kane, David, and Philip Platt. Ultrasound. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199642489.003.0067.
Повний текст джерелаАнотація:
Musculoskeletal ultrasound (MSUS) is rapidly becoming a standard part of many rheumatologists' daily clinical practice. MSUS is safe, increasingly widely available, relatively low cost, non-invasive, and hence very acceptable to the patient. Current problems with availability of training, mentoring, and accreditation procedures need to be overcome for MSUS to reach its full potential for rheumatologists. MSUS is capable of improving clinical diagnosis and the accuracy of intervention. MSUS is more sensitive than clinical examination in the detection of synovitis and effusion and is capable of rapid targeted assessment of widely spaced joints coupled with clinical correlation. MSUS has advantages over other imaging modalities; the ability to display dynamic real-time movement makes it the imaging modality of choice for tendon problems. It is significantly more sensitive than plain radiology in the demonstration of early erosive changes, and although its sensitivity is less than that of MRI for the detection of erosions it is far more practical, timely, and available. The combination of sensitivity in detection of synovitis, tenosynovitis, and erosions makes it an ideal imaging modality in the context of an early arthritis clinic. Power Doppler has been shown to be an effective way of evaluating synovitis and hence is of value in early diagnosis and monitoring of inflammatory arthritides. The accuracy of placement of local injection therapies is enhanced by MSUS, and it significantly increases the diagnostic success rate of aspiration of joints and bursas. The flexibility of ultrasound as a tool for rheumatologists is shown by its application in the assessment of vasculitides, peripheral nerve pathology, salivary glands, and skin lesions.
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Kane, David, and Philip Platt. Ultrasound. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199642489.003.0067_update_002.
Повний текст джерелаАнотація:
Musculoskeletal ultrasound (MSUS) is rapidly becoming a standard part of many rheumatologists’ daily clinical practice. MSUS is safe, increasingly widely available, relatively low cost, non-invasive, and hence very acceptable to the patient. Current problems with availability of training, mentoring, and accreditation procedures need to be overcome for MSUS to reach its full potential for rheumatologists. MSUS is capable of improving clinical diagnosis and the accuracy of intervention. MSUS is more sensitive than clinical examination in the detection of synovitis and effusion and is capable of rapid targeted assessment of widely spaced joints coupled with clinical correlation. MSUS has advantages over other imaging modalities; the ability to display dynamic real-time movement makes it the imaging modality of choice for tendon problems. It is significantly more sensitive than plain radiology in the demonstration of early erosive changes, and although its sensitivity is less than that of MRI for the detection of erosions it is far more practical, timely, and available. The combination of sensitivity in detection of synovitis, tenosynovitis, and erosions makes it an ideal imaging modality in the context of an early arthritis clinic. Power Doppler has been shown to be an effective way of evaluating synovitis and hence is of value in early diagnosis and monitoring of inflammatory arthritides. The accuracy of placement of local injection therapies is enhanced by MSUS, and it significantly increases the diagnostic success rate of aspiration of joints and bursas. The flexibility of ultrasound as a tool for rheumatologists is shown by its application in the assessment of vasculitides, peripheral nerve pathology, salivary glands, and skin lesions.
Частини книг з теми "Non-local correlation"
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Bechstedt, Friedhelm. "Non-local Exchange and Correlation." In Springer Series in Solid-State Sciences, 163–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-44593-8_9.
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Ludeña, Eduardo V., Aníbal Sierraalta, Eugene S. Kryachko, and Antonio Hernández. "Non-Local Correlation and Point Transformations in Density Functional Theory." In Condensed Matter Theories, 121–30. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-0917-8_14.
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Six, J. "Can Non-Detected Photons Simulate Non-Local Effects in Two-Photon Polarization Correlation Experiments ?" In Open Questions in Quantum Physics, 171–81. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5245-4_12.
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Savin, A., H. Preuss, and H. Stoll. "Non-Local Effects on Atomic and Molecular Correlation Energies Studied with A Gradient-Corrected Density Functional." In Density Matrices and Density Functionals, 457–65. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3855-7_23.
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Andronache, Adrian, Philippe Cattin, and Gábor Székely. "Local Intensity Mapping for Hierarchical Non-rigid Registration of Multi-modal Images Using the Cross-Correlation Coefficient." In Biomedical Image Registration, 26–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11784012_4.
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Endres, Manuel. "Non-local Correlations in One Dimension." In Springer Theses, 57–72. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05753-8_6.
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Tschinke, Vincenzo, and Tom Ziegler. "An Evaluation of Local Electron Correlation Corrections and Non-Local Exchange Corrections to the Hartree-Fock-Slater Method from Calculations on Bond Energies and Electronic Spectra of Molecular Systems." In Density Matrices and Density Functionals, 467–77. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3855-7_24.
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Endres, Manuel. "Non-local Correlations in Two Dimensions, Duality and Distribution Functions." In Springer Theses, 73–91. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05753-8_7.
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Andersen, Kristian Gjerrestad, Gbanaibolou Jombo, Sikiru Oluwarotimi Ismail, Yong Kang Chen, Hom Nath Dhakal, and Yu Zhang. "Damage Characterisation in Composite Laminates Using Vibro-Acoustic Technique." In Springer Proceedings in Energy, 275–82. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63916-7_34.
Повний текст джерелаАнотація:
AbstractThe need to characterise in-service damage in composite structures is increasingly becoming important as composites find higher utilisation in wind turbines, aerospace, automotive, marine, among others. This paper investigates the feasibility of simplifying the conventional acousto-ultrasonic technique set-up for quick and economic one-sided in-service inspection of composite structures. Acousto-ultrasonic technique refers to the approach of using ultrasonic transducer for local excitation while sensing the material response with an acoustic emission sensor. However, this involves transducers with several auxiliaries. The approach proposed herewith, referred to as vibro-acoustic testing, involves a low level of vibration impact excitation and acoustic emission sensing for damage characterisation. To test the robustness of this approach, first, a quasi-static test was carried out to impute low-velocity impact damage on three groups of test samples with different ply stacking sequences. Next, the vibro-acoustic testing was performed on all test samples with the acoustic emission response for the samples acquired. Using the acoustic emission test sample response for all groups, the stress wave factor was determined using the peak voltage stress wave factor method. The stress wave factor results showed an inverse correlation between the level of impact damage and stress wave factor across all the test sample groups. This corresponds with what has been reported in literature for acousto-ultrasonic technique; thus demonstrating the robustness of the proposed vibro-acoustic set-up. Structural health monitoring, impact damage, acousto-ultrasonic testing, non-destructive testing.
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Aldemir, Ceray, and Tuğba Uçma Uysal. "The Potential Correlation Between Organizational Structure and Financial Sustainability in Turkish Local Government." In Advances in Electronic Government, Digital Divide, and Regional Development, 224–47. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-3713-7.ch010.
Повний текст джерелаАнотація:
Throughout the membership process of the EU, Turkey has undergone various transformations in public administration structure. For this reason, the financial and public transformation experienced by Turkey in the Europeanization process must be evaluated. Financial localization and financial sustainability (FS) in local governments are one of the reflections of this transformation. Despite being a non-profit structure, financial sustainability seems to be extremely important in terms of local government units. Financial and economic crises, especially those at global level, have highlighted the need to address FS in non-profit bodies. In the light of the above-mentioned explanations, this chapter analyses the potential correlation between organizational structure and FS in Turkish Local Government—focusing on 14 municipalities in Muğla City—by conducting in-debt interviews. Therefore, the main aim of this chapter is to show the interest of local governments to use voluntary reporting, in terms of ethical-social-environmental, as a tool for financial sustainability.
Тези доповідей конференцій з теми "Non-local correlation"
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Huhle, Benjamin, Timo Schairer, and Wolfgang Strasser. "Normalized Cross-Correlation using SOFT." In 2009 International Workshop on Local and Non-Local Approximation in Image Processing (LNLA 2009). IEEE, 2009. http://dx.doi.org/10.1109/lnla.2009.5278398.
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Wang, Guo-gang, Xiu-chang Zhu, and Zong-liang Gan. "Image demosaicing by non-local similarity and local correlation." In 2012 11th International Conference on Signal Processing (ICSP 2012). IEEE, 2012. http://dx.doi.org/10.1109/icosp.2012.6491704.
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Ha, Manh-Hung, and Oscal Tzyh-Chiang Chen. "Non-Local Spatiotemporal Correlation Attention for Action Recognition." In 2022 IEEE International Conference on Multimedia and Expo Workshops (ICMEW). IEEE, 2022. http://dx.doi.org/10.1109/icmew56448.2022.9859314.
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Settembrini, Francesca Fabiana, Alexa Marina Herter, Ileana-Crsitina Benea-Chelmus, Frieder Lindel, Giacomo Scalari, and Jérȏme Faist. "Exploring field correlation measurements on the electromagnetic ground state in non-local regime." In CLEO: Applications and Technology. Washington, D.C.: OSA, 2021. http://dx.doi.org/10.1364/cleo_at.2021.jtu3a.153.
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Ma, Yuqing, Xianglong Liu, Shihao Bai, Lei Wang, Dailan He, and Aishan Liu. "Coarse-to-Fine Image Inpainting via Region-wise Convolutions and Non-Local Correlation." In Twenty-Eighth International Joint Conference on Artificial Intelligence {IJCAI-19}. California: International Joint Conferences on Artificial Intelligence Organization, 2019. http://dx.doi.org/10.24963/ijcai.2019/433.
Повний текст джерелаАнотація:
Recently deep neural networks have achieved promising performance for filling large missing regions in image inpainting tasks. They usually adopted the standard convolutional architecture over the corrupted image, where the same convolution filters try to restore the diverse information on both existing and missing regions, and meanwhile ignores the long-distance correlation among the regions. Only relying on the surrounding areas inevitably leads to meaningless contents and artifacts, such as color discrepancy and blur. To address these problems, we first propose region-wise convolutions to locally deal with the different types of regions, which can help exactly reconstruct existing regions and roughly infer the missing ones from existing regions at the same time. Then, a non-local operation is introduced to globally model the correlation among different regions, promising visual consistency between missing and existing regions. Finally, we integrate the region-wise convolutions and non-local correlation in a coarse-to-fine framework to restore semantically reasonable and visually realistic images. Extensive experiments on three widely-used datasets for image inpainting tasks have been conducted, and both qualitative and quantitative experimental results demonstrate that the proposed model significantly outperforms the state-of-the-art approaches, especially for the large irregular missing regions.
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Zhu, Wenjing, Oscar C. Au, Wei Dai, Haitao Yang, Rui Ma, Luheng Jia, Jin Zeng, and Pengfei Wan. "Palette-based compound image compression in HEVC by exploiting non-local spatial correlation." In ICASSP 2014 - 2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). IEEE, 2014. http://dx.doi.org/10.1109/icassp.2014.6855027.
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Zhang, Qing, and Lu Yu. "A higher order transform domain filter exploiting non-local spatial correlation for video coding." In 2017 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE, 2017. http://dx.doi.org/10.1109/iscas.2017.8050324.
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Berkovich, Hila, David Malah, and Meir Barzohar. "Effect of correlation between Non-Local Means patch dissimilarities on search region adaptation for improved image denoising." In 2014 IEEE 28th Convention of Electrical & Electronics Engineers in Israel (IEEEI). IEEE, 2014. http://dx.doi.org/10.1109/eeei.2014.7005854.
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Nadali, Hossein N., Matts Karlsson, Mats Kinell, and Esa Utriainen. "Film Effectiveness Correlations for Cylindrical and Fan-Shaped Holes, Introducing Local Pressure Coefficient." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69021.
Повний текст джерелаАнотація:
Most of the proposed correlations for prediction of gas turbine film cooling performance in the open literature rely on experiments conducted on flat plates. These correlations neglect adverse pressure gradient effects present in the flow field for airfoil like configurations. The continuous change in flow characteristics in the main flow field from leading edge to trailing edge that will affect the film cooling performance is also neglected. In this study correlations are derived from measurements conducted on a gas turbine vane working at engine like conditions. This will take into account the effect of hole position and the local flow situation. Indeed, cooling holes located at three (five) different positions with blowing ratio ranges from 0.3–2.5 (0.9–6) have been considered along the suction (pressure) sides. The non-dimensional pressure coefficient CP, at the exit location of each hole has been introduced as a new variable to derive a single correlation for either suction or pressure sides. Three main variables: downstream distance, blowing ratio, and local CP together with the two way interaction between these variables are introduced into a commercial statistical analysis program, Minitab. Stepwise regression analysis has been performed to highlight factors with greatest influence on the correlation model. Appropriateness of the derived model is measured based on the adjusted coefficient of determination, Radj2. Correlations are derived for eight different configurations: for suction and pressure sides, cylindrical and fan-shaped holes and in the presence and absence of showerhead cooling. Despite the complexity of the flow due to high blowing ratio (existence of lift off) and also variation of film cooling performance from one position to another, the calculated Radj2 values indicate a high predictability of the proposed correlation model. The suggested correlation model can be useful for optimizing the location of one or several rows of cooling holes around the vane and also one single row performance.
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Solovjov, Vladimir P., and Brent W. Webb. "Application of the Cumulative Wavenumber Approach for Modeling Radiative Transfer in H2O Under Non-Isothermal and Non-Homogeneous Conditions." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33886.
Повний текст джерелаАнотація:
Recently, the cumulative wavenumber approach was formulated and its viability demonstrated in predictions of radiative heat transfer in high temperature CO2. The approach allows for local spectrum correlation, rather than full-spectrum correlation as commonly done previously. This work reports on the generation of cumulative wavenumber data for H2O, and explores solutions using the cumulative wavenumber approach for water vapor (balance nitrogen) in homogeneous/non-isothermal media, and extends the technique to non-homogeneous/non-isothermal scenarios. Model predictions are compared with rigorous line-by-line benchmark integration of the Radiative Transfer Equation, with the same spectral database (HITEMP) used in both model and line-by-line benchmark predictions.
Звіти організацій з теми "Non-local correlation"
1
Campi, Mercedes, Marco Dueñas, and Tommaso Ciarli. Open configuration options Do Creative Industries Enhance Employment Growth? Regional Evidence from Colombia. Inter-American Development Bank, February 2022. http://dx.doi.org/10.18235/0003993.
Повний текст джерелаАнотація:
Creative industries are considered highly innovative and productive, constituting an important driver of economic change. For high-income countries, several studies discuss the positive spillovers of creative industries for the local economy, for instance by attracting creative workers, which can benet entrepreneurs and workers in other industries. Like many other activities, creative industries are likely to dier in low- and middle-income countries compared to high-income countries. Moreover, the existing evidence is based on correlations between variables likely to be endogenous. This paper contributes to the literature on the role of creative industries in driving economic change in two main ways. First, we make a rst attempt to control for endogeneity and identify the impact of creative industries on local economies. Second, we report evidence for a middle-income country. Using granular employment data, we study the agglomeration patterns of creative industries across Colombian cities between 2008 and 2017. Exploiting the co-location of creative industries with other industries, we estimate the relation between employment growth in creative and non-creative industries in the same city. Using a shift-share instrumental variable approach, we estimate the multiplier eect of employment growth in creative industries on the employment growth in the rest of the economy. Creative industries represented between 2.7 and 3.3 percent of Colombian employment in 2008 and 2017. We nd that creative industries agglomerate mainly in three large cities (Bogota, Medelln, and Cartagena) and in a few smaller cities. Such agglomeration is positively related to an increase in the employment of non-creative services industries. For a positive causal relation to materialize, creative industries should have a larger size or be more connected to other economic sectors. However, after controlling for endogeneity, we nd no signicant impact of an increase of creative industries employment on employment growth in other industries.
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Heitman, Joshua L., Alon Ben-Gal, Thomas J. Sauer, Nurit Agam, and John Havlin. Separating Components of Evapotranspiration to Improve Efficiency in Vineyard Water Management. United States Department of Agriculture, March 2014. http://dx.doi.org/10.32747/2014.7594386.bard.
Повний текст джерелаАнотація:
Vineyards are found on six of seven continents, producing a crop of high economic value with much historic and cultural significance. Because of the wide range of conditions under which grapes are grown, management approaches are highly varied and must be adapted to local climatic constraints. Research has been conducted in the traditionally prominent grape growing regions of Europe, Australia, and the western USA, but far less information is available to guide production under more extreme growing conditions. The overarching goal of this project was to improve understanding of vineyard water management related to the critical inter-row zone. Experiments were conducted in moist temperate (North Carolina, USA) and arid (Negev, Israel) regions in order to address inter-row water use under high and low water availability conditions. Specific objectives were to: i) calibrate and verify a modeling technique to identify components of evapotranspiration (ET) in temperate and semiarid vineyard systems, ii) evaluate and refine strategies for excess water removal in vineyards for moist temperate regions of the Southeastern USA, and iii) evaluate and refine strategies for water conservation in vineyards for semi-arid regions of Israel. Several new measurement and modeling techniques were adapted and assessed in order to partition ET between favorable transpiration by the grapes and potentially detrimental water use within the vineyard inter-row. A micro Bowen ratio measurement system was developed to quantify ET from inter-rows. The approach was successful at the NC site, providing strong correlation with standard measurement approaches and adding capability for continuous, non-destructive measurement within a relatively small footprint. The environmental conditions in the Negev site were found to limit the applicability of the technique. Technical issues are yet to be solved to make this technique sufficiently robust. The HYDRUS 2D/3D modeling package was also adapted using data obtained in a series of intense field campaigns at the Negev site. The adapted model was able to account for spatial variation in surface boundary conditions, created by diurnal canopy shading, in order to accurately calculate the contribution of interrow evaporation (E) as a component of system ET. Experiments evaluated common practices in the southeastern USA: inter-row cover crops purported to reduce water availability and thereby favorably reduce grapevine vegetative growth; and southern Israel: drip irrigation applied to produce a high value crop with maximum water use efficiency. Results from the NC site indicated that water use by the cover crop contributed a significant portion of vineyard ET (up to 93% in May), but that with ample rainfall typical to the region, cover crop water use did little to limit water availability for the grape vines. A potential consequence, however, was elevated below canopy humidity owing to the increased inter-row evapotranspiration associated with the cover crops. This creates increased potential for fungal disease occurrence, which is a common problem in the region. Analysis from the Negev site reveals that, on average, E accounts for about10% of the total vineyard ET in an isolated dripirrigated vineyard. The proportion of ET contributed by E increased from May until just before harvest in July, which could be explained primarily by changes in weather conditions. While non-productive water loss as E is relatively small, experiments indicate that further improvements in irrigation efficiency may be possible by considering diurnal shading effects on below canopy potential ET. Overall, research provided both scientific and practical outcomes including new measurement and modeling techniques, and new insights for humid and arid vineyard systems. Research techniques developed through the project will be useful for other agricultural systems, and the successful synergistic cooperation amongst the research team offers opportunity for future collaboration.
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Galili, Naftali, Roger P. Rohrbach, Itzhak Shmulevich, Yoram Fuchs, and Giora Zauberman. Non-Destructive Quality Sensing of High-Value Agricultural Commodities Through Response Analysis. United States Department of Agriculture, October 1994. http://dx.doi.org/10.32747/1994.7570549.bard.
Повний текст джерелаАнотація:
The objectives of this project were to develop nondestructive methods for detection of internal properties and firmness of fruits and vegetables. One method was based on a soft piezoelectric film transducer developed in the Technion, for analysis of fruit response to low-energy excitation. The second method was a dot-matrix piezoelectric transducer of North Carolina State University, developed for contact-pressure analysis of fruit during impact. Two research teams, one in Israel and the other in North Carolina, coordinated their research effort according to the specific objectives of the project, to develop and apply the two complementary methods for quality control of agricultural commodities. In Israel: An improved firmness testing system was developed and tested with tropical fruits. The new system included an instrumented fruit-bed of three flexible piezoelectric sensors and miniature electromagnetic hammers, which served as fruit support and low-energy excitation device, respectively. Resonant frequencies were detected for determination of firmness index. Two new acoustic parameters were developed for evaluation of fruit firmness and maturity: a dumping-ratio and a centeroid of the frequency response. Experiments were performed with avocado and mango fruits. The internal damping ratio, which may indicate fruit ripeness, increased monotonically with time, while resonant frequencies and firmness indices decreased with time. Fruit samples were tested daily by destructive penetration test. A fairy high correlation was found in tropical fruits between the penetration force and the new acoustic parameters; a lower correlation was found between this parameter and the conventional firmness index. Improved table-top firmness testing units, Firmalon, with data-logging system and on-line data analysis capacity have been built. The new device was used for the full-scale experiments in the next two years, ahead of the original program and BARD timetable. Close cooperation was initiated with local industry for development of both off-line and on-line sorting and quality control of more agricultural commodities. Firmalon units were produced and operated in major packaging houses in Israel, Belgium and Washington State, on mango and avocado, apples, pears, tomatoes, melons and some other fruits, to gain field experience with the new method. The accumulated experimental data from all these activities is still analyzed, to improve firmness sorting criteria and shelf-life predicting curves for the different fruits. The test program in commercial CA storage facilities in Washington State included seven apple varieties: Fuji, Braeburn, Gala, Granny Smith, Jonagold, Red Delicious, Golden Delicious, and D'Anjou pear variety. FI master-curves could be developed for the Braeburn, Gala, Granny Smith and Jonagold apples. These fruits showed a steady ripening process during the test period. Yet, more work should be conducted to reduce scattering of the data and to determine the confidence limits of the method. Nearly constant FI in Red Delicious and the fluctuations of FI in the Fuji apples should be re-examined. Three sets of experiment were performed with Flandria tomatoes. Despite the complex structure of the tomatoes, the acoustic method could be used for firmness evaluation and to follow the ripening evolution with time. Close agreement was achieved between the auction expert evaluation and that of the nondestructive acoustic test, where firmness index of 4.0 and more indicated grade-A tomatoes. More work is performed to refine the sorting algorithm and to develop a general ripening scale for automatic grading of tomatoes for the fresh fruit market. Galia melons were tested in Israel, in simulated export conditions. It was concluded that the Firmalon is capable of detecting the ripening of melons nondestructively, and sorted out the defective fruits from the export shipment. The cooperation with local industry resulted in development of automatic on-line prototype of the acoustic sensor, that may be incorporated with the export quality control system for melons. More interesting is the development of the remote firmness sensing method for sealed CA cool-rooms, where most of the full-year fruit yield in stored for off-season consumption. Hundreds of ripening monitor systems have been installed in major fruit storage facilities, and being evaluated now by the consumers. If successful, the new method may cause a major change in long-term fruit storage technology. More uses of the acoustic test method have been considered, for monitoring fruit maturity and harvest time, testing fruit samples or each individual fruit when entering the storage facilities, packaging house and auction, and in the supermarket. This approach may result in a full line of equipment for nondestructive quality control of fruits and vegetables, from the orchard or the greenhouse, through the entire sorting, grading and storage process, up to the consumer table. The developed technology offers a tool to determine the maturity of the fruits nondestructively by monitoring their acoustic response to mechanical impulse on the tree. A special device was built and preliminary tested in mango fruit. More development is needed to develop a portable, hand operated sensing method for this purpose. In North Carolina: Analysis method based on an Auto-Regressive (AR) model was developed for detecting the first resonance of fruit from their response to mechanical impulse. The algorithm included a routine that detects the first resonant frequency from as many sensors as possible. Experiments on Red Delicious apples were performed and their firmness was determined. The AR method allowed the detection of the first resonance. The method could be fast enough to be utilized in a real time sorting machine. Yet, further study is needed to look for improvement of the search algorithm of the methods. An impact contact-pressure measurement system and Neural Network (NN) identification method were developed to investigate the relationships between surface pressure distributions on selected fruits and their respective internal textural qualities. A piezoelectric dot-matrix pressure transducer was developed for the purpose of acquiring time-sampled pressure profiles during impact. The acquired data was transferred into a personal computer and accurate visualization of animated data were presented. Preliminary test with 10 apples has been performed. Measurement were made by the contact-pressure transducer in two different positions. Complementary measurements were made on the same apples by using the Firmalon and Magness Taylor (MT) testers. Three-layer neural network was designed. 2/3 of the contact-pressure data were used as training input data and corresponding MT data as training target data. The remaining data were used as NN checking data. Six samples randomly chosen from the ten measured samples and their corresponding Firmalon values were used as the NN training and target data, respectively. The remaining four samples' data were input to the NN. The NN results consistent with the Firmness Tester values. So, if more training data would be obtained, the output should be more accurate. In addition, the Firmness Tester values do not consistent with MT firmness tester values. The NN method developed in this study appears to be a useful tool to emulate the MT Firmness test results without destroying the apple samples. To get more accurate estimation of MT firmness a much larger training data set is required. When the larger sensitive area of the pressure sensor being developed in this project becomes available, the entire contact 'shape' will provide additional information and the neural network results would be more accurate. It has been shown that the impact information can be utilized in the determination of internal quality factors of fruit. Until now,
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Epel, Bernard L., Roger N. Beachy, A. Katz, G. Kotlinzky, M. Erlanger, A. Yahalom, M. Erlanger, and J. Szecsi. Isolation and Characterization of Plasmodesmata Components by Association with Tobacco Mosaic Virus Movement Proteins Fused with the Green Fluorescent Protein from Aequorea victoria. United States Department of Agriculture, September 1999. http://dx.doi.org/10.32747/1999.7573996.bard.
Повний текст джерелаАнотація:
The coordination and regulation of growth and development in multicellular organisms is dependent, in part, on the controlled short and long-distance transport of signaling molecule: In plants, symplastic communication is provided by trans-wall co-axial membranous tunnels termed plasmodesmata (Pd). Plant viruses spread cell-to-cell by altering Pd. This movement scenario necessitates a targeting mechanism that delivers the virus to a Pd and a transport mechanism to move the virion or viral nucleic acid through the Pd channel. The identity of host proteins with which MP interacts, the mechanism of the targeting of the MP to the Pd and biochemical information on how Pd are alter are questions which have been dealt with during this BARD project. The research objectives of the two labs were to continue their biochemical, cellular and molecular studies of Pd composition and function by employing infectious modified clones of TMV in which MP is fused with GFP. We examined Pd composition, and studied the intra- and intercellular targeting mechanism of MP during the infection cycle. Most of the goals we set for ourselves were met. The Israeli PI and collaborators (Oparka et al., 1999) demonstrated that Pd permeability is under developmental control, that Pd in sink tissues indiscriminately traffic proteins of sizes of up to 50 kDa and that during the sink to source transition there is a substantial decrease in Pd permeability. It was shown that companion cells in source phloem tissue export proteins which traffic in phloem and which unload in sink tissue and move cell to cell. The TAU group employing MP:GFP as a fluorescence probe for optimized the procedure for Pd isolation. At least two proteins kinases found to be associated with Pd isolated from source leaves of N. benthamiana, one being a calcium dependent protein kinase. A number of proteins were microsequenced and identified. Polyclonal antibodies were generated against proteins in a purified Pd fraction. A T-7 phage display library was created and used to "biopan" for Pd genes using these antibodies. Selected isolates are being sequenced. The TAU group also examined whether the subcellular targeting of MP:GFP was dependent on processes that occurred only in the presence of the virus or whether targeting was a property indigenous to MP. Mutant non-functional movement proteins were also employed to study partial reactions. Subcellular targeting and movement were shown to be properties indigenous to MP and that these processes do not require other viral elements. The data also suggest post-translational modification of MP is required before the MP can move cell to cell. The USA group monitored the development of the infection and local movement of TMV in N. benthamiana, using viral constructs expressing GFP either fused to the MP of TMV or expressing GFP as a free protein. The fusion protein and/or the free GFP were expressed from either the movement protein subgenomic promoter or from the subgenomic promoter of the coat protein. Observations supported the hypothesis that expression from the cp sgp is regulated differently than expression from the mp sgp (Szecsi et al., 1999). Using immunocytochemistry and electron microscopy, it was determined that paired wall-appressed bodies behind the leading edge of the fluorescent ring induced by TMV-(mp)-MP:GFP contain MP:GFP and the viral replicase. These data suggest that viral spread may be a consequence of the replication process. Observation point out that expression of proteins from the mp sgp is temporary regulated, and degradation of the proteins occurs rapidly or more slowly, depending on protein stability. It is suggested that the MP contains an external degradation signal that contributes to rapid degradation of the protein even if expressed from the constitutive cp sgp. Experiments conducted to determine whether the degradation of GFP and MP:GFP was regulated at the protein or RNA level, indicated that regulation was at the protein level. RNA accumulation in infected protoplast was not always in correlation with protein accumulation, indicating that other mechanisms together with RNA production determine the final intensity and stability of the fluorescent proteins.
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Jury, William A., and David Russo. Characterization of Field-Scale Solute Transport in Spatially Variable Unsaturated Field Soils. United States Department of Agriculture, January 1994. http://dx.doi.org/10.32747/1994.7568772.bard.
Повний текст джерелаАнотація:
This report describes activity conducted in several lines of research associated with field-scale water and solute processes. A major effort was put forth developing a stochastic continuum analysis for an important class of problems involving flow of reactive and non reactive chemicals under steady unsaturated flow. The field-scale velocity covariance tensor has been derived from local soil properties and their variability, producing a large-scale description of the medium that embodies all of the local variability in a statistical sense. Special cases of anisotropic medium properties not aligned along the flow direction of spatially variable solute sorption were analysed in detail, revealing a dependence of solute spreading on subtle features of the variability of the medium, such as cross-correlations between sorption and conductivity. A novel method was developed and tested for measuring hydraulic conductivity at the scale of observation through the interpretation of a solute transport outflow curve as a stochastic-convective process. This undertaking provided a host of new K(q) relationships for existing solute experiments and also laid the foundation for future work developing a self-consistent description of flow and transport under these conditions. Numerical codes were developed for calculating K(q) functions for a variety of solute pulse outflow shapes, including lognormal, Fickian, Mobile-Immobile water, and bimodal. Testing of this new approach against conventional methodology was mixed, and agreed most closely when the assumptions of the new method were met. We conclude that this procedure offers a valuable alternative to conventional methods of measuring K(q), particularly when the application of the method is at a scale (e.g. and agricultural field) that is large compared to the common scale at which conventional K(q) devices operate. The same problem was approached from a numerical perspective, by studying the feasibility of inverting a solute outflow signal to yield the hydraulic parameters of the medium that housed the experiment. We found that the inverse problem was solvable under certain conditions, depending on the amount of noise in the signal and the degree of heterogeneity in the medium. A realistic three dimensional model of transient water and solute movement in a heterogeneous medium that contains plant roots was developed and tested. The approach taken was to generate a single realization of this complex flow event, and examine the results to see whether features were present that might be overlooked in less sophisticated model efforts. One such feature revealed is transverse dispersion, which is a critically important component in the development of macrodispersion in the longitudinal direction. The lateral mixing that was observed greatly exceeded that predicted from simpler approaches, suggesting that at least part of the important physics of the mixing process is embedded in the complexity of three dimensional flow. Another important finding was the observation that variability can produce a pseudo-kinetic behavior for solute adsorption, even when the local models used are equilibrium.