Gotowe bibliografie tematyczne / Spatial control

Gotowa bibliografia na temat „Spatial control”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 28 stycznia 2023

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Artykuły w czasopismach na temat "Spatial control"

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Weiner, Andrew M. "Spatial coherent control". Nature Photonics 7, nr 1 (27.12.2012): 6–8. http://dx.doi.org/10.1038/nphoton.2012.334.

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Jordan, J. Scott, i Günther Knoblich. "Spatial perception and control". Psychonomic Bulletin & Review 11, nr 1 (luty 2004): 54–59. http://dx.doi.org/10.3758/bf03206460.

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Spiliotis, Elias T., i W. James Nelson. "Spatial control of exocytosis". Current Opinion in Cell Biology 15, nr 4 (sierpień 2003): 430–37. http://dx.doi.org/10.1016/s0955-0674(03)00074-7.

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Rojas, Juan David, i Rubén Darío Guevara Gonzalez. "Spatial MCUSUM Control Chart". Revista Colombiana de Estadística 43, nr 1 (1.01.2020): 49–70. http://dx.doi.org/10.15446/rce.v43n1.78748.

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This paper proposes a spatial multivariate CUSUM control chart in order to monitor the mean of a single characteristic of a product or process, when the measurements are taken in different locations on each sampled item. To estimate the variance and covariance matrix some tools from the geostatistics are used, taking into account the spatial correlation between the measurements. The performance of this control chart is explored by simulation and its use is illustrated with an example.
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Sapaty, P. S. "Symbiosis of Distributed Simulation and Control under Spatial Grasp Technology". Mathematical machines and systems 3 (2020): 23–48. http://dx.doi.org/10.34121/1028-9763-2020-3-23-48.

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We are witnessing rapidly growing world dynamics caused by climate change, military, religious and ethnic conflicts, terrorism, refugee flows and weapons proliferation, political and industrial restructuring too. Dealing with frequently emerging crises may need rapid integration of scattered heterogeneous resources into capable operational forces pursuing goals which may not be known in advance. Proper understanding and managing of unpredictable and crisis situations may need their detailed simulation at runtime and even ahead of it. The current paper aims at deep integration, actually symbiosis, of advanced simulation with live system control and management, which can be effectively organized in nationwide and world scale. It will be presenting the latest version of Spatial Grasp Technology (SGT) which is not based on traditional communicating parts or agents, as usual, but rather using self-spreading, self-replicating, and self-modifying higher-level code covering and matching distributed systems at runtime while providing global integrity, goal-orientation, and finding effective solutions. These spatial solutions are often hundreds of times shorter and simpler than with other approaches due to special recursive scenario language hiding traditional system management routines inside its parallel and distributed interpretation. The paper provides basics for deep integration, actually symbiosis, of different worlds allowing us to unite advanced distributed simulation with spatial parallel and fully distributed control, while doing all this within the same high-level and very simple Spatial Grasp formalism and its basic Spatial Grasp Language (SGL). It will also mention various SGT applications including economy, ecology, space research & conquest and security, where effective symbiosis of distributed interactive simulation with live control and management may provide a real breakthrough. SGL can be quickly implemented even within standard university environments by a group of system programmers, similar to its previous versions in different countries under the author’s supervision. The technology can be installed in numerous copies worldwide and deeply integrated with any other systems, actually acquiring unlimited power throughout the world.
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Burke, S. E., i J. E. Hubbard. "Spatial Filtering Concepts in Distributed Parameter Control". Journal of Dynamic Systems, Measurement, and Control 112, nr 4 (1.12.1990): 565–73. http://dx.doi.org/10.1115/1.2896181.

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A new method of analyzing distributed parameter control systems is presented, based upon their input/output representation in a spatially and temporally transformed frequency space. The classes of distributed systems amenable to the analysis are described in terms of their Green’s functions. The plants’ input/output relations are studied in the transformed space using the singular value decomposition to determine the system’s spatial performance. Performance is quantified in terms of generalized command following, disturbance rejection, noise rejection, controllability, and observability over spatial and temporal bandwidths, with suitable design measures presented. The analysis provides insight into the performance of sensor and actuator distributions in achieving spatial frequency performance specifications, determines spatial regimes where the response is directional, and quantifies sensor and actuator placement with respect to limitations of system and transducer spatial modelling. The analysis is shown to be applicable to discrete as well as distributed sensors and actuators, and utilizes commonly available numerical analysis techniques. An example problem is considered.
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Meyyappan, Sreenivasan, Abhijit Rajan, Jesse Bengson, George Mangun i Mingzhou Ding. "Decoding visual spatial attention control". Journal of Vision 20, nr 11 (20.10.2020): 156. http://dx.doi.org/10.1167/jov.20.11.156.

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Zou, X., H. Y. Xu, K. Shi i X. B. Fang. "Optimal Spatial Camera Orientation Control". Journal of Physics: Conference Series 1682 (listopad 2020): 012035. http://dx.doi.org/10.1088/1742-6596/1682/1/012035.

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Cliff, A. D., i P. Haggett. "Spatial aspects of epidemic control". Progress in Human Geography 13, nr 3 (wrzesień 1989): 315–47. http://dx.doi.org/10.1177/030913258901300301.

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Preumont, A., A. François, P. De Man i V. Piefort. "Spatial filters in structural control". Journal of Sound and Vibration 265, nr 1 (lipiec 2003): 61–79. http://dx.doi.org/10.1016/s0022-460x(02)01440-2.

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Rozprawy doktorskie na temat "Spatial control"

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Messin, Liam J. "Spatial control of microtubule shrinkage". Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/94871/.

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Microtubules are long linear polymers that switch randomly between periods of growth and shrinkage, in a process known as dynamic instability. In vivo, dynamic instability is regulated by microtubule associated proteins (MAPs). One class of MAPS, the kinesins, move actively along microtubules, and some regulate microtubule dynamics. Kinesin-8, a kinesin, regulates microtubule dynamics in a wide range of eukaryotic cells. Schizosaccharomyces pombe (S. pombe) provides a well-characterised system in which to study microtubule regulation by MAPs. During interphase, microtubules grow from the centre of the rod-shaped cell until their plus ends reach and pause at the cell end, before undergoing catastrophe and shrinking. Shrinkage occurs predominantly at cell ends, even as the cell grows longer. I have studied the cell biology of kinesin-8-dependent interphase microtubule dynamics in S. pombe. I have identified an interphase-specific binding partner of S. pombe kinesin-8 (Klp5/Klp6); Mcp1. Mcp1 was required for Klp5/Klp6 accumulation at interphase microtubule plus ends and for Klp5/Klp6 induced interphase microtubule shrinkage. Tea2 (a kinesin) and Tip1 (CLIP170 orthologue) were found to stabilise interphase microtubules. Cells lacking Tea2 or Tip1 displayed interphase microtubules which, after reaching cell ends, underwent shrinkage sooner than wild type cells. Cells lacking Klp5/Klp6 or Mcp1 showed the opposite phenotype, microtubules which dwelt at cell ends longer than control cells before shrinking. Klp5/Klp6 accumulation on interphase microtubule plus ends steadily increased, peaking just before microtubule shrinkage. In contrast, Tea2 accumulated rapidly to newly nucleated interphase microtubule plus ends and was lost before microtubule shrinkage. I propose a model in which Tea2 prevents Klp5/Klp6 induced microtubule shrinkage until the interphase microtubule has grown to the cell end, where Tea2 is lost. At the cell end Klp5/Klp6 now induce shrinkage.
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Lino, Christophe. "Virtual camera control using dynamic spatial partitions". Phd thesis, Université Rennes 1, 2013. http://tel.archives-ouvertes.fr/tel-00916835.

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Virtual camera control is nowadays an essential component in many computer graphics applications. Despite its importance, current approaches remain limited in their expressiveness, interactive nature and performances. Typically, elements of directorial style and genre cannot be easily modeled nor simulated due to the lack of simultaneous control in viewpoint computation, camera path planning and editing. Second, there is a lack in exploring the creative potential behind the coupling of a human with an intelligent system to assist users in the complex task of designing cinematographic sequences. Finally, most techniques are based on computationally expensive optimization techniques performed in a 6D search space, which prevents their application to real-time contexts. In this thesis, we first propose a unifying approach which handles four key aspects of cinematography (viewpoint computation, camera path planning, editing and visibility computation) in an expressive model which accounts for some elements of directorial style. We then propose a workflow allowing to combine automated intelligence with user interaction. We finally present a novel and efficient approach to virtual camera control which reduces the search space from 6D to 3D and has the potential to replace a number of existing formulations.
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Ni, Jie. "Control of the spatial double inverted pendulum". Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104855.

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The stabilization of a hip-actuated spatial double inverted pendulum can be considered as a problem of postural control of a humanoid robot. Based on an existing model of this underactuated mechanical system with four degrees of freedom, the ultimate objective is to design a suitable controller to achieve global stabilization around the unstable upright equilibrium position. This thesis presents a number of control algorithms and simulation results that provide either local stabilization or semi-global swing-up. For the effort of local stabilization in the vicinity of the upright equilibrium position, both an lqr controller and three types of linearization-based sliding mode control algorithms are presented. The region of convergence of the lqr controller is investigated. System performance and robustness against disturbances are compared for all controllers.In order to realize semi-global swing-up, two types of nonlinear sliding mode control approaches are explored for the swing up of the system in an attempt to bring the system into the region of convergence of the local linear controllers. The hybrid approach is proposed to switch from the swing-up controller to a local linear controller under certain conditions in the vicinity of the upright equilibrium to complete the stabilization effort. However, despite extensive tuning of the controllers, it has not been possible to achieve global stabilization with such an approach. Further investigation is needed in order to resolve this issue. The main contribution of this thesis is a successful extension of existing 2-dimensional sliding mode control algorithms into 3-D for the control of the spatial double inverted pendulum. The linearization-based sliding mode controllers serve as alternatives to lqr for local stabilization. The nonlinear sliding mode controllers are able bring the system from a configuration far from the upright equilibrium to the vicinity of the unstable upright equilibrium in semi-global swing-up.
La stabilisation d'un double pendule spatiale inversé actionné à la hanche peut-être considérée comme un problème de contrôle de la posture d'un robot humanoïde. Basé sur un modèle existant de ce système mécanique sous-actionné avec quatre degrés de liberté, l'ultime objectif est de concevoir un régulateur approprié pour obtenir une stabilisation globale autour de l'instable position d'équilibre debout. Cette thèse présente un certain nombre d'algorithmes de contrôle et les résultats de simulation qui permettent une stabilisation locale ou semi-globale pivoter-vers-le-haut. Pour l'effort de stabilisation locale dans le voisinage de la position d'équilibre en position verticale, à la fois un contrôleur lqr et trois types de linéarisation basée sur des algorithmes de contrôle de mode glissant sont présentés. La région de la convergence du contrôleur lqr est étudiée. La performance et la robustesse du système sont comparées pour tous les contrôleurs. Afin de réaliser la strateǵie semi-globale pivoter-vers-le-haut, deux types d'approches de commande non linéaire de mode glissant sont explorés pour le balancement du système dans un essai pour amener le système dans la région de convergence locale des contrôleurs linéaires. L'approche hybride est proposée pour passer du contrôleur pour pivoter-vers-le-haut à un contrôleur linéaire local sous certaines conditions dans le voisinage de l'équilibre en position verticale afin de compléter l'effort de stabilisation. Toutefois, malgré des ajustements des contrôleurs, il n'a pas été possible de parvenir à une stabilisation globale avec une telle approche. Une enquête plus profonde est nécessaire pour résoudre ce problème. La contribution principale de cette thèse est la réussite une d'extension d'algorithmes de commande de 2-dimensions de mode glissant qui existent pour le cas de 3-D pour le contrôle du double pendule inversé spatial. Les contrôleurs de mode glissant basés sur un modèle du système linéarisé servent comme alternatives au contrôleur lqr pour la stabilisation locale. Les contrôleurs de mode glissant non-linéaires sont capables, à partir d'une configuration loin de l'équilibre de mettre le système dans la proximité de l'équilibre debout vertical utilisant le principe semi-global pivoter-vers-le-haut.
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Gauthier, Thomas P. 1980. "Spatial control of cavitation in therapeutic ultrasound". Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/30171.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.
Includes bibliographical references (p. 60-65).
Inertial cavitation has been implicated as the primary mechanism for a host of emerging applications. In all these applications, the main concern is to induce cavitation in perfectly controlled locations in the field; this means specifically to be able to achieve cavitation threshold at the geometrical focus of the transducer without stimulating its near field. In this study, we make use of dual-frequency methods to preferentially lower the cavitation threshold at the focus relative to the rest of the field. One family of dual-frequency driving waveforms is evaluated in a bubble model incorporating rectified diffusion. Theoretical predictions based on Sokka's work (Sokka 2003a) are confirmed in vitro using Optison[TM], a commercially available contrast agent. The performance of the rest of acoustic field in suppressing cavitation when cavitation is induced at the focus is investigated theoretically and checked experimentally. This first part shows that dual-frequency phased arrays could be used to precisely control cavitation. Cavitation threshold is proved to be 1.2 times higher in the near field than at the focus. One of the main limitations of the aforementioned protocol is that it is tightly controlled. As an example, Optison[TM] has a mean bubble size of 2 - 4.5 [micro]m, which means that the initial bubble radii will fall in this range. Since cavitation threshold has been proved to depend on this parameter, using ultrasound contrast agents allows for more predictable results. Therefore, in the second half of this study, we propose a focused ultrasound protocol that induces and monitors gas bubbles at the focus and allows for ex vivo validation of the aforementioned theoretical results. The experiments involve fresh rabbit tissue and a statistical analysis is performed over data collected from back muscle.
(cont.) Moreover, the experimental apparatus is designed to be MRI-compatible to make future in vivo assessments feasible. This second half of the study demonstrates that the theoretical predictions made earlier can reliably be used to predict dual-frequency cavitation thresholds. It also suggests that clinical use of dual-frequency excitations might be a solution to the problem of spatial control of cavitation.
by Thomas P. Gauthier.
S.M.
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Chen, Yiyang. "Iterative learning control for spatial path tracking". Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/415865/.

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Iterative learning control (ILC) is a high performance method for systems operating in a repetitive manner, which aims to improve tracking performance by learning from previous trial information. In recent years research interest has focused on generalizing the task description in order to achieve greater performance and flexibility. In particular, researchers have addressed the ease of tracking only at a single, or a collection of time instants. However, there still remain substantial open problems, such as the choice of the time instants, the need for system constraint handling, and the ability to release explicit dependence on time. A number of ILC methods have tackled the latter problem, loosely termed spatial ILC, but are all application specific and limited in scope. The aim of this thesis is to unlock this potential, and the specific contributions are as follows: first a mechanism to optimize the time instants at the critical tracking positions within point-to-point tracking is developed. This is achieved by embedding an additional cost function and deriving a ‘Two Stage’ design framework to yield an iterative algorithm which minimizes control effort as well as guaranteeing high performance tracking. This approach is based on norm optimal ILC and gradient minimization. Then the task description is further generalized by expanding the formulation to embed via-point constraint and linear planar constraints. This embeds the incorporation of various design objectives including spatial path tracking in a general class of systems, and a mixed form of system constraints are added into this framework. An algorithmic ILC solution is derived using the successive projection method to achieve high performance tracking of the design objectives. Finally, the Two Stage design framework and the generalized ILC framework are combined together to yield the first spatial ILC algorithm capable of optimizing an additional cost function whilst completing the spatial path tracking objective for a general class of systems. All proposed algorithms are verified experimentally on a gantry robot platform, whose experimental results demonstrate their practical efficacy and ability to substantially widen the scope of the current ILC framework.
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Chen, Chih-Keng. "Nonholonomic control of coupled spatial multibody systems". Case Western Reserve University School of Graduate Studies / OhioLINK, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=case1057091907.

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Fairbairn, Jonathan Paul. "Spatial and temporal dynamics of entomopathogenic nematodes". Thesis, University of Stirling, 2001. http://hdl.handle.net/1893/26685.

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The life-history and infection parameters of the entomopathogenic nematodes Steinernema feltiae (Filipjev)(Nematoda:Rhabditida) and Heterorhahditis megidis (Poinar, Jackson & Klein)(Nematoda:Rhabditida) were examined to provide specific details for the construction of mathematical SI models for biological control of soil insect pests. Laboratory experiments using the Greater Waxmoth, Galleria mellonella as the model host were undertaken to specifically examine the transmission behaviour of infective juvenile nematodes. The proportion of infective juveniles of S. feltiae which infected hosts was dependent on time. Previous studies declared that the proportion of infective juveniles which can infect is static, however, over a period of 5 days most of the infective juveniles infected hosts, demonstrating that the proportion infecting is dynamic. Infection of hosts by both species of nematode was compared using two mathematical representations of the transmission rate. Whereas the most parsimonious form of transmission for H. megidis was the linear Mass Action function, it was evident that, when measured at the individual nematode scale, S. feltiae transmission was non-linear. I postulated that this functional difference is due to the biology of the two species of nematodes. The subsequent effect of including the non-linear response on model predictions were investigated and it was demonstrated that the dynamics of the host nematode interaction became less stable. Spatial models of S. feltiae infection were parameterised from laboratory experiments, and control prediction of these models examined. The horizontal rate of dispersal through sand columns was determined in the presence and absence of hosts. Infective juveniles were found to disperse preferentially towards hosts. The predicted dynamics of pest control using the spatial moqel were highly dependent on the degree of nematode dispersal, host dispersal and the attraction of nematode infective juveniles towards hosts. The overall findings of this thesis have been placed in the context of epidemiological models created elsewhere, and predict that entomopathogenic nematodes may be targeted to specific pest systems with a high degree of success. An understanding of the infection biology of these nematode species is crucial in determining how and when pests may be controlled, and equally importantly, which systems successful control is not predicted.
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Lee, Yong Keat. "Active vibration control of a piezoelectric laminate plate using spatial control approach". Title page, abstract and table of contents only, 2005. http://hdl.handle.net/2440/37711.

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This thesis represents the work that has been done by the author during his Master of Engineering Science candidature in the area of vibration control of flexible structures at the School of Mechanical Engineering, The University of Adelaide, between March 2003 and June 2004. The aim of this research is to further extend the application of the Spatial Control Approach for two-dimensional flexible structures for attenuating global structural vibration with the possible implication of reduction in noise radiation. The research was concentrated on a simply supported thin flexible plate, using piezoelectric ceramic materials as actuators and sensors. In this work, active controllers were designed for the purpose of controlling only the first five vibration modes (0-500Hz) of the plate. A spatial controller was designed to minimize the total energy of the spatially distributed signal, which is reflected by the spatial H2 norm of the transfer function from the disturbance signal to the vibration output at every point over the plate. This approach ensures the vibration contributed by all the in bandwidth (0-500 Hz) vibration modes is minimized, and hence is capable of minimizing vibration throughout the entire plate. Within the control framework, two cases were considered here; the case when the prior knowledge of the incoming disturbance in terms of reference signal is vailable and the case when it is not available. For the case when the reference signal is available, spatial feedforward controller was designed; whereas for the case when the reference signal is not available, spatial feedback controller was designed to attenuate the global disturbance. The effectiveness of spatial controllers was then compared with that of the standard point-wise controllers numerically and experimentally. The experimental results were found to reflect the numerical results, and the results demonstrated that spatial controllers are able to reduce the energy transfer from the disturbance to the structural output across the plate in a more uniform way than the point-wise controllers. The research work has demonstrated that spatial controller managed to minimize the global plate vibrations and noise radiation that were due to the first five modes.
Thesis (M.Eng.Sc.)--School of Mechanical Engineering, 2005.
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Volpe, Giorgio. "Nanoscale spatial control of light in optical antennas". Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/96168.

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El control dinámico y determinístico de la luz en una escala espacial por debajo de la longitud de onda es un requisito clave para ampliar los conceptos y las funcionalidades de la macro-óptica hasta la escala nanométrica. Un mayor nivel de control también tendrá implicaciones importantes en nuestra comprensión de los fenómenos ópticos en la nanoescala. Uno de los principales problemas en nano-óptica tiene como objetivo describir cómo y con qué precisión es posible controlar la distribución espacial de la luz de forma dinámica en la nanoescala. Desafortunadamente, un límite fundamental de la física – el límite de difracción de la luz – afecta nuestra capacidad de seleccionar ópticamente puntos separados por menos de media longitud de onda de la luz. El campo de la plasmónica ofrece una oportunidad única para cerrar la brecha entre el límite de difracción y la escala nanométrica. Nanoantenas metálicas pueden acoplarse eficientemente a luz propagante y focalizarla en volúmenes nanométricos, y viceversa. Además, estas nanoantenas prometen mejorar significativamente la eficiencia de procesos como le fotodetección, la emisión de luz, sensores, transferencia de calor, y espectroscopía a la escala nanométrica. Aprender a controlar de forma precisa la respuesta óptica de estas nanoantenas representa un enfoque muy prometedor para controlar la distribución espacial y temporal de la luz a la escala nanométrica. Tradicionalmente, se han desarrollado dos principales estrategias para el control de la respuesta óptica de nanoantenas plasmónicas: la primer estrategia (estrategia estática) tiene como objetivo la optimización del diseño geométrico de las nanoantenas acorde a su aplicación, mientras que la segunda estrategia (estrategia dinámica) tiene como objetivo la modulación reversible del campo cercano de una nanoestructura dada a través de la manipulación de la luz de excitación en el tiempo y el espacio. El trabajo presentado en esta Tesis extiende el estado del arte de estas dos estrategias, y desarrolla nuevas herramientas, tanto experimentales como teóricas, para ampliar el nivel de control que tenemos sobre la distribución espacial de la luz debajo del límite de difracción. Después de presentar una visión general de los principios básicos de nano-óptica y de la óptica de lo plasmones de superficie, el Capítulo 1 repasa los avances en el control de la respuesta óptica de nanoestructuras metálicas – sea por una estrategia estática o dinámica – en el momento en que se inició este trabajo de investigación. La modificación de la geometría y las dimensiones de las nanpartículas metálicas sigue siendo un ingrediente fundamental para controlar las resonancias plasmónicas y los campos de luz a la escala nanométrica. Como ejemplos novedosos de control estático, por lo tanto, los Capítulos 2 y 3 estudian nuevos diseños de estructuras plasmónicas con capacidades sin precedentes de modelar campos de luz a la escala nanométrica, en particular un diseño fractal y una nanoantena unidireccional tipo Yagi-Uda. Los Capítuols 4 y 5 describen una nueva herramienta teórica y experimental para el control dinámico y determinístico de la respuesta óptica de nanoantenas basada en la modulación espacial de la fase de la luz de excitación: el campo óptico cercano, que resulta de la interacción entre la luz y las nanoestructuras plasmónicas, es normalmente determinado por la geometría del sistema metálico y las propiedades de la luz incidente, como su longitud de onda y su polarización; sin embargo, el control exacto y dinámico del campo óptico cercano debajo de límite de difracción de la luz – independientemente de la geometría de la nanoestructura – es también un ingrediente importante para el desarrollo de futuros dispositivos nano-ópticos y para ampliar los conceptos y las funcionalidades de la óptica macroscópica a la escala nanométrica. Finalmente, la Conclusión resume los resultados de este trabajo y ofrece una visión general de algunos estudios paralelos a esta tesis. Algunas de las observaciones finales permiten echar un vistazo a las perspectivas y estrategias futuras para complementar el control estático y el control dinámico en una única herramienta, que podría avanzar enormemente nuestra capacidad de controlar la respuesta óptica de nanoantennas debajo del límite de difracción.
El control dinámico y determinístico de la luz en una escala espacial por debajo de la longitud de onda es un requisito clave para ampliar los conceptos y las funcionalidades de la macro-óptica hasta la escala nanométrica. Un mayor nivel de control también tendrá implicaciones importantes en nuestra comprensión de los fenómenos ópticos en la nanoescala. Uno de los principales problemas en nano-óptica tiene como objetivo describir cómo y con qué precisión es posible controlar la distribución espacial de la luz de forma dinámica en la nanoescala. Desafortunadamente, un límite fundamental de la física – el límite de difracción de la luz – afecta nuestra capacidad de seleccionar ópticamente puntos separados por menos de media longitud de onda de la luz. El campo de la plasmónica ofrece una oportunidad única para cerrar la brecha entre el límite de difracción y la escala nanométrica. Nanoantenas metálicas pueden acoplarse eficientemente a luz propagante y focalizarla en volúmenes nanométricos, y viceversa. Además, estas nanoantenas prometen mejorar significativamente la eficiencia de procesos como le fotodetección, la emisión de luz, sensores, transferencia de calor, y espectroscopía a la escala nanométrica. Aprender a controlar de forma precisa la respuesta óptica de estas nanoantenas representa un enfoque muy prometedor para controlar la distribución espacial y temporal de la luz a la escala nanométrica. Tradicionalmente, se han desarrollado dos principales estrategias para el control de la respuesta óptica de nanoantenas plasmónicas: la primer estrategia (estrategia estática) tiene como objetivo la optimización del diseño geométrico de las nanoantenas acorde a su aplicación, mientras que la segunda estrategia (estrategia dinámica) tiene como objetivo la modulación reversible del campo cercano de una nanoestructura dada a través de la manipulación de la luz de excitación en el tiempo y el espacio. El trabajo presentado en esta Tesis extiende el estado del arte de estas dos estrategias, y desarrolla nuevas herramientas, tanto experimentales como teóricas, para ampliar el nivel de control que tenemos sobre la distribución espacial de la luz debajo del límite de difracción. Después de presentar una visión general de los principios básicos de nano-óptica y de la óptica de lo plasmones de superficie, el Capítulo 1 repasa los avances en el control de la respuesta óptica de nanoestructuras metálicas – sea por una estrategia estática o dinámica – en el momento en que se inició este trabajo de investigación. La modificación de la geometría y las dimensiones de las nanpartículas metálicas sigue siendo un ingrediente fundamental para controlar las resonancias plasmónicas y los campos de luz a la escala nanométrica. Como ejemplos novedosos de control estático, por lo tanto, los Capítulos 2 y 3 estudian nuevos diseños de estructuras plasmónicas con capacidades sin precedentes de modelar campos de luz a la escala nanométrica, en particular un diseño fractal y una nanoantena unidireccional tipo Yagi-Uda. Los Capítuols 4 y 5 describen una nueva herramienta teórica y experimental para el control dinámico y determinístico de la respuesta óptica de nanoantenas basada en la modulación espacial de la fase de la luz de excitación: el campo óptico cercano, que resulta de la interacción entre la luz y las nanoestructuras plasmónicas, es normalmente determinado por la geometría del sistema metálico y las propiedades de la luz incidente, como su longitud de onda y su polarización; sin embargo, el control exacto y dinámico del campo óptico cercano debajo de límite de difracción de la luz – independientemente de la geometría de la nanoestructura – es también un ingrediente importante para el desarrollo de futuros dispositivos nano-ópticos y para ampliar los conceptos y las funcionalidades de la óptica macroscópica a la escala nanométrica. Finalmente, la Conclusión resume los resultados de este trabajo y ofrece una visión general de algunos estudios paralelos a esta tesis. Algunas de las observaciones finales permiten echar un vistazo a las perspectivas y estrategias futuras para complementar el control estático y el control dinámico en una única herramienta, que podría avanzar enormemente nuestra capacidad de controlar la respuesta óptica de nanoantennas debajo del límite de difracción.
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Bullock, Adrian. "SPACE : SPatial Access Control for collaborative virtual Environments". Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285675.

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Książki na temat "Spatial control"

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Dunant, Halim, i Fleming Andrew J, red. Spatial control of vibration: Theory and experiments. River Edge, N.J: World Scientific, 2003.

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del, Pobil Angel Pasqual, i Serna Miguel Angel, red. Spatial representation and motion planning. Berlin: Springer-Verlag, 1995.

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Wenzhong, Shi, Goodchild Michael F i Fisher Peter, red. Spatial data quality. London: Taylor & Francis, 2002.

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Kung, Hsiao-Feng. Dynamics and control of a spatial truss actuator. Blacksburg, Va: Virginia Polytechnic Institute and State University, 1988.

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Hubbard, James E. Spatial Filtering for the Control of Smart Structures. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-03804-4.

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Dylla, Frank. An agent control perspective on qualitative spatial reasoning: Towards more intuitive spatial agent development. Heidelberg: Akademische Verlagsgesellschaft, 2008.

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Jackson, David P. Spatial control of transcription in flowers of Antirrhinum majus. Norwich: University ofEast Anglia, 1991.

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Talhofer, Václav, Šárka Hošková-Mayerová i Alois Hofmann. Quality of Spatial Data in Command and Control System. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-94562-0.

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River control in India: Spatial, governmental and subjective dimensions. Cham: Springer, 2014.

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Hubbard, James E. Spatial filtering for the control of smart structures: An Introduction. Heidelberg: Springer, 2010.

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Części książek na temat "Spatial control"

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Klauser, Francisco, i Sarah Widmer. "Surveillance and Control". W Understanding Spatial Media, 216–24. 1 Oliver’s Yard, 55 City Road London EC1Y 1SP: SAGE Publications Ltd, 2017. http://dx.doi.org/10.4135/9781526425850.n20.

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Weiss, Gabriel, Erik Weiss, Roland Weiss, Slavomír Labant i Karol Bartoš. "The Compatibility of 3D Spatial Points". W Survey Control Points, 29–35. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-28457-6_5.

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Zhen, Chen, Chen Rongguo i Xie Jiong. "Fine-Grained Spatial Access Control in Spatial Database". W Advanced Technology in Teaching - Proceedings of the 2009 3rd International Conference on Teaching and Computational Science (WTCS 2009), 823–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25437-6_111.

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Milner, A. David, i Monika Harvey. "Visuomotor control of spatially directed action". W Imagery and Spatial Cognition, 297–322. Amsterdam: John Benjamins Publishing Company, 2006. http://dx.doi.org/10.1075/aicr.66.23mil.

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Munje, Ravindra, Balasaheb Patre i Akhilanand Tiwari. "Comparison of Spatial Control Techniques". W Energy Systems in Electrical Engineering, 145–55. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3014-7_9.

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Dai, Jing, i Chang-Tien Lu. "Concurrency Control for Spatial Access". W Encyclopedia of GIS, 1–2. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-23519-6_175-2.

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Caccavale, F., C. Natale, B. Siciliano i L. Villani. "Experiments of spatial impedance control". W Experimental Robotics V, 91–104. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/bfb0112953.

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Dai, Jing, i Chang-Tien Lu. "Concurrency Control for Spatial Access". W Encyclopedia of GIS, 285–86. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-17885-1_175.

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Dai, Jing, i Chang-Tien Lu. "Concurrency Control for Spatial Access". W Encyclopedia of GIS, 124. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_175.

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Sapaty, Peter Simon. "Spatial Grasp Language, SGL". W Studies in Systems, Decision and Control, 43–78. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01830-6_3.

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Streszczenia konferencji na temat "Spatial control"

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Thomas, James A., i Yeshaiahu Fainman. "A Multistage Arrangement for Programmable Diffractive Optical Elements providing Simplified Array Control". W Spatial Light Modulators. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/slmo.1997.swc.4.

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Multichannel arrays of phase modulators are attractive as fast, high resolution random-access beam deflectors and can find direct application to such areas as projection display and programmable optical interconnects. Because of their similarity to a stepped-phase diffractive optical element (DOE) we call these devices programmable DOEs. Several forms of programmable DOEs for beam steering have been reported including a compact liquid crystal based system1 and faster electrooptic based devices.2-3 The electrooptic (E-O) systems permit much faster switching rates but at the cost of higher drive voltages. We have focused our efforts on the development of an electooptic programmable DOE based on lanthanum-modified lead zirconate titanate (PLZT). A simple device of this type is shown in Fig. 1 (from Ref. 3).
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Canoglu, Ergun, Elsa Garmire, I. Lahiri, D. D. Nolte i M. R. Melloch. "Pre-illumination to Control The Active Trap Density in a Semi-Insulating MQW Device". W Spatial Light Modulators. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/slmo.1997.smc.4.

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Semiconductor photorefractive quantum well devices are prime candidates for high speed real-time image processing applications because of their high speed, small thickness and large electro-optic nonlinearities1,2,3. When used in the Stark geometry, where a field is applied perpendicular to MQW layers, the optical nonlinearity arises from longitudinal field screening in the illuminated areas. Lateral spatial modulation of the field screening is translated to lateral spatial modulation of refractive index and absorption by the quantum confined Stark effect. Device performance is characterized by spatial resolution and sensitivity, both of which strongly depend on carrier transport. The spatial resolution decreases with increased lateral carrier transport4,5, while the sensitivity increases with increased longitudinal transport. Highly trapping materials have been successfully used to increase the device resolution down to 5-7 μm6,7.
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Fan, Yong-hua, Jun Yang i Yu-zhuo Zhang. "Robust control of hypersonic aircraft". W Second International Conference on Spatial Information Technology, redaktorzy Cheng Wang, Shan Zhong i Jiaolong Wei. SPIE, 2007. http://dx.doi.org/10.1117/12.775194.

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Jeang-Kuo Chen. "Concurrency control of spatial join on spatial database". W Fourth Annual ACIS International Conference on Computer and Information Science (ICIS'05). IEEE, 2005. http://dx.doi.org/10.1109/icis.2005.39.

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Lu, Chunyan, i Jing Wang. "Data quality control in eco-environmental monitoring". W Second International Conference on Spatial Information Technology, redaktorzy Cheng Wang, Shan Zhong i Jiaolong Wei. SPIE, 2007. http://dx.doi.org/10.1117/12.780351.

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Braun, Sebastian, Oliver Thiergart i Emanuel A. P. Habets. "Automatic spatial gain control for an informed spatial filter". W ICASSP 2014 - 2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). IEEE, 2014. http://dx.doi.org/10.1109/icassp.2014.6853713.

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Wang, Peng, i Zhou Zhou. "Piecewise linear control allocation for flying wing UAV". W Second International Conference on Spatial Information Technology, redaktorzy Cheng Wang, Shan Zhong i Jiaolong Wei. SPIE, 2007. http://dx.doi.org/10.1117/12.773337.

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Pan, Wei, Weihua Li, Gaozu Wang i Jun Du. "Reverse analysis and trustworthy control for operating system security". W Second International Conference on Spatial Information Technology, redaktorzy Cheng Wang, Shan Zhong i Jiaolong Wei. SPIE, 2007. http://dx.doi.org/10.1117/12.775000.

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Ma, Yufeng, Shenguang Gong, Xiulin Hu i Yunyu Zhang. "A fuzzy call admission control scheme in wireless networks". W Second International Conference on Spatial Information Technology, redaktorzy Cheng Wang, Shan Zhong i Jiaolong Wei. SPIE, 2007. http://dx.doi.org/10.1117/12.775233.

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Zhang, Jingjing, Gun A. Lee, Simon Hoermann, Wendy Zhang i Thammathip Piumsomboon. "Virtual Triplets: Human-Agent Shared Control of Virtual Avatars". W SUI '22: Symposium on Spatial User Interaction. New York, NY, USA: ACM, 2022. http://dx.doi.org/10.1145/3565970.3568184.

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Raporty organizacyjne na temat "Spatial control"

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Cressie, Noel A. Spatial Statistics for Command and Control. Fort Belvoir, VA: Defense Technical Information Center, listopad 2005. http://dx.doi.org/10.21236/ada441157.

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Cronin, Thomas W. Natural Models for Autonomous Control of Spatial Navigation, Sensing, and Guidance. Fort Belvoir, VA: Defense Technical Information Center, maj 2013. http://dx.doi.org/10.21236/ada594988.

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Marshall, Justin, Thomas Cronin i Nick Roberts. Natural Models for Autonomous Control of Spatial Navigation, Sensing, and Guidance, Part 1. Fort Belvoir, VA: Defense Technical Information Center, czerwiec 2011. http://dx.doi.org/10.21236/ada547656.

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Morales, Leonardo Fabio, i Eleonora Dávalos. Diffusion of crime control benefits: Forced eradication and coca crops in Colombia. Banco de la República Colombia, listopad 2022. http://dx.doi.org/10.32468/dtseru.314.

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One explanation for the increasing number of hectares with coca cultivation is that eradication strategies displace coca crops but fail to completely clear affected areas. In the drug policy literature, that dynamic shifting is commonly known as the balloon effect. This study integrates georeferenced agricultural data through spatially explicit econometric models to test the hypothesis that forced eradication displace coca crops. Using annual data for 1,116 contiguous municipalities in Colombia between 2001 and 2015, we estimate a spatial Durbin model with municipal and time fixed effects. Our results suggest that, on average, aerial fumigation in a municipality diffuses the benefits of this crime control strategy to neighboring municipalities.
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Schilling, Jonathan. Final Technical Report - Consolidating Biomass Pretreatment with Saccharification by Resolving the Spatial Control Mechanisms of Fungi. Office of Scientific and Technical Information (OSTI), lipiec 2017. http://dx.doi.org/10.2172/1368078.

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Stevens, James A. Spatial Reuse through Dynamic Power and Routing Control in Common-Channel Random-Access Packet Radio Networks. Fort Belvoir, VA: Defense Technical Information Center, sierpień 1988. http://dx.doi.org/10.21236/ada197898.

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Harms, Nathan, i Judy Shearer. Spatial and temporal variability of the Alligatorweed pathogen, Alternaria alternantherae, in Louisiana. Engineer Research and Development Center (U.S.), maj 2022. http://dx.doi.org/10.21079/11681/44402.

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Alligatorweed leaf spot is a disease of invasive Alternanthera philoxeroides (Alligatorweed) in the southern US, caused by Alternaria alternantherae. However, little is known about when or where this pathogen naturally occurs. To better understand this species’ life history, we examined temporal (every 2–3 weeks) and spatial (latitudinal) patterns of A. alternantherae occurrence at sites in Louisiana for 2 y. Pathogen presence reflected clear within-year temporal and spatial patterns. Overall, the percentage of leaves infected with A. alternantherae was low during spring each year (0–20% infected) but increased throughout summer (maximum of 50% infected), and plants in northern sites had lower frequency of infection relative to southern sites until later in the year (late summer/early fall) but only in 1 of the 2 years of our study. The mean proportion of leaves infected with A. alternantherae declined with latitude both years (P = 0.01) and variability increased with latitude (P = 0.04), a pattern suggestive of range limitation in northern areas. We estimate a northern distributional limit of 34°N for A. alternantherae in Louisiana, but Alligatorweed occurs farther north. Although we did not directly examine disease impacts to Alligatorweed during the study, they may be greatest in southern areas, where the pathogen is more common early and throughout the growing season, and thus may be less likely to provide control in northern infestations of the invasive Alligatorweed.
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Heinz, Kevin, Itamar Glazer, Moshe Coll, Amanda Chau i Andrew Chow. Use of multiple biological control agents for control of western flower thrips. United States Department of Agriculture, 2004. http://dx.doi.org/10.32747/2004.7613875.bard.

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The western flower thrips (WFT), Frankliniella occidentalis (Pergande), is a serious widespread pest of vegetable and ornamental crops worldwide. Chemical control for Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) on floriculture or vegetable crops can be difficult because this pest has developed resistance to many insecticides and also tends to hide within flowers, buds, and apical meristems. Predatory bugs, predatory mites, and entomopathogenic nematodes are commercially available in both the US and Israel for control of WFT. Predatory bugs, such as Orius species, can suppress high WFT densities but have limited ability to attack thrips within confined plant parts. Predatory mites can reach more confined habitats than predatory bugs, but kill primarily first-instar larvae of thrips. Entomopathogenic nematodes can directly kill or sterilize most thrips stages, but have limited mobility and are vulnerable to desiccation in certain parts of the crop canopy. However, simultaneous use of two or more agents may provide both effective and cost efficient control of WFT through complimentary predation and/or parasitism. The general goal of our project was to evaluate whether suppression of WFT could be enhanced by inundative or inoculative releases of Orius predators with either predatory mites or entomopathogenic nematodes. Whether pest suppression is best when single or multiple biological control agents are used, is an issue of importance to the practice of biological control. For our investigations in Texas, we used Orius insidiosus(Say), the predatory mite, Amblyseius degeneransBerlese, and the predatory mite, Amblyseius swirskii(Athias-Henriot). In Israel, the research focused on Orius laevigatus (Fieber) and the entomopathogenic nematode, Steinernema felpiae. Our specific objectives were to: (1) quantify the spatial distribution and population growth of WFT and WFT natural enemies on greenhouse roses (Texas) and peppers (Israel), (2) assess interspecific interactions among WFT natural enemies, (3) measure WFT population suppression resulting from single or multiple species releases. Revisions to our project after the first year were: (1) use of A. swirskiiin place of A. degeneransfor the majority of our predatory mite and Orius studies, (2) use of S. felpiaein place of Thripinema nicklewoodi for all of the nematode and Orius studies. We utilized laboratory experiments, greenhouse studies, field trials and mathematical modeling to achieve our objectives. In greenhouse trials, we found that concurrent releases of A.degeneranswith O. insidiosusdid not improve control of F. occidentalis on cut roses over releases of only O. insidiosus. Suppression of WFT by augmentative releases A. swirskiialone was superior to augmentative releases of O. insidiosusalone and similar to concurrent releases of both predator species on cut roses. In laboratory studies, we discovered that O. insidiosusis a generalist predator that ‘switches’ to the most abundant prey and will kill significant numbers of A. swirskiior A. degeneransif WFTbecome relatively less abundant. Our findings indicate that intraguild interactions between Orius and Amblyseius species could hinder suppression of thrips populations and combinations of these natural enemies may not enhance biological control on certain crops. Intraguild interactions between S. felpiaeand O. laevigatus were found to be more complex than those between O. insidiosusand predatory mites. In laboratory studies, we found that S. felpiaecould infect and kill either adult or immature O. laevigatus. Although adult O. laevigatus tended to avoid areas infested by S. felpiaein Petri dish arenas, they did not show preference between healthy WFT and WFT infected with S. felpiaein choice tests. In field cage trials, suppression of WFT on sweet-pepper was similar in treatments with only O. laevigatus or both O. laevigatus and S. felpiae. Distribution and numbers of O. laevigatus on pepper plants also did not differ between cages with or without S. felpiae. Low survivorship of S. felpiaeafter foliar applications to sweet-pepper may explain, in part, the absence of effects in the field trials. Finally, we were interested in how differential predation on different developmental stages of WFT (Orius feeding on WFT nymphs inhabiting foliage and flowers, nematodes that attack prepupae and pupae in the soil) affects community dynamics. To better understand these interactions, we constructed a model based on Lotka-Volterra predator-prey theory and our simulations showed that differential predation, where predators tend to concentrate on one WFT stage contribute to system stability and permanence while predators that tend to mix different WFT stages reduce system stability and permanence.
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Lundgren, Jonathan, Moshe Coll i James Harwood. Biological control of cereal aphids in wheat: Implications of alternative foods and intraguild predation. United States Department of Agriculture, październik 2014. http://dx.doi.org/10.32747/2014.7699858.bard.

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The overall objective of this proposal is to understand how realistic strategies for incorporating alternative foods into wheat fields affect the intraguild (IG) interactions of omnivorous and carnivorous predators and their efficacy as biological control agents. Cereal aphids are a primary pest of wheat throughout much of the world. Naturally occurring predator communities consume large quantities of cereal aphids in wheat, and are partitioned into aphid specialists and omnivores. Within wheat fields, the relative abilities of omnivorous and carnivorous predators to reduce cereal aphids depend heavily on the availability, distribution and type of alternative foods (alternative prey, sugar, and pollen), and on the intensity and direction of IG predation events within this community. A series of eight synergistic experiments, carefully crafted to accomplish objectives while accounting for regional production practices, will be conducted to explore how cover crops (US, where large fields preclude effective use of field margins) and field margins (IS, where cover crops are not feasible) as sources of alternative foods affect the IG interactions of predators and their efficacy as biological control agents. These objectives are: 1. Determine the mechanisms whereby the availability of alternative prey and plant-provided resources affect pest suppression by omnivorous and carnivorous generalist predators; 2. Characterize the intensity of IGP within generalist predator communities of wheat systems and assess the impact of these interactions on cereal aphid predation; and 3. Evaluate how spatial patterns in the availability of non-prey resources and IGP affect predation on cereal aphids by generalist predator communities. To accomplish these goals, novel tools, including molecular and biochemical gut content analysis and geospatial analysis, will be coupled with traditional techniques used to monitor and manipulate insect populations and predator efficacy. Our approach will manipulate key alternative foods and IG prey to determine how these individual interactions contribute to the ability of predators to suppress cereal aphids within systems where cover crop and field margin management strategies are evaluated in production scale plots. Using these strategies, the proposed project will not only provide cost-effective and realistic solutions for pest management issues faced by IS and US producers, but also will provide a better understanding of how spatial dispersion, IG predation, and the availability of alternative foods contribute to biological control by omnivores and carnivores within agroecosystems. By reducing the reliance of wheat producers on insecticides, this proposal will address the BARD priorities of increasing the efficiency of agricultural production and protecting plants against biotic sources of stress in an environmentally friendly and sustainable manner.
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Harms, Nathan, Judy Shearer, James Cronin i John Gaskin. Geographic and genetic variation in susceptibility of Butomus umbellatus to foliar fungal pathogens. Engineer Research and Development Center (U.S.), sierpień 2021. http://dx.doi.org/10.21079/11681/41662.

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Large-scale patterns of plant invasions may reflect regional heterogeneity in biotic and abiotic factors and genetic variation within and between invading populations. Having information on how effects of biotic resistance vary spatially can be especially important when implementing biological control because introduced agents may have different Impacts through interactions with host-plant genotype, local environment, or other novel enemies. We conducted a series of field surveys and laboratory studies to determine whether there was evidence of biotic resistance, as foliar fungal pathogens, in two introduced genotypes (triploid G1, diploid G4) of the Eurasian wetland weed, Butomus umbellatus L. in the USA. We tested whether genotypes differed in disease attack and whether spatial patterns in disease incidence were related to geographic location or climate for either genotype. After accounting for location (latitude, climate), G1 plants had lower disease incidence than G4 plants in the field (38% vs. 70%) but similar pathogen richness. In contrast, bioassays revealed G1 plants consistently received a higher damage score and had larger leaf lesions regardless of pathogen. These results demonstrate that two widespread B. umbellatus genotypes exhibit different susceptibility to pathogens and effectiveness of pathogen biological controls may depend on local conditions.
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